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Cheah, CA

Chern Yih Cheah, Redwood City, CA US

Patent application numberDescriptionPublished
20130145096GENERATING AN ORDERED SEQUENCE IN A DATABASE SYSTEM USING MULTIPLE INTERLEAVED CACHES - A method, system, and computer program product is disclosed for generating an ordered sequence from a predetermined sequence of symbols using protected interleaved caches, such as semaphore protected interleaved caches. The approach commences by dividing the predetermined sequence of symbols into two or more interleaved caches, then mapping each of the two or more interleaved caches to a particular semaphore of a group of semaphores. The group of semaphores is organized into bytes or machine words for storing the group of semaphores into a shared memory, the shared memory accessible by a plurality of session processes. Protected (serialized) access by the session processes is provided by granting access to one of the two or more interleaved caches only after one of the plurality of session processes performs a semaphore altering read-modify-write operation (e.g., a CAS) on the particular semaphore. The interleaved caches are assigned values successively from the predetermined sequence using a round-robin assignment technique.06-06-2013

Chris Cheah, San Jose, CA US

Patent application numberDescriptionPublished
20090049049Method and System for Controlled Distribution of Profile Information and Related Data Objects - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.02-19-2009
20090049059Method and System for Controlled Distribution of Profiles and Related Content Via Centralized Network-Based Resources - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.02-19-2009
20090049149Method and System for Controlled Distribution of Information Over a Network - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.02-19-2009
20090055730Method and System for Controlled Distribution of User Customized Profiles Over a Network - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.02-26-2009
20090055747Method and System for Controlled Access to Profile Information for Non-Affiliated Users Over a Network - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.02-26-2009
20090063512Method and System for Controlled Distribution of Profile Information with Communication Support - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.03-05-2009
20090089292Method and System for Controlled Distribution of One or More Distinct Profiles for a User - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.04-02-2009
20110320531SYSTEM FOR CONTROLLED DISTRIBUTION OF USER PROFILES OVER A NETWORK - An information management and distribution system is disclosed. The information management and distribution system facilitates the controlled exchange of contact information over a network. The system can support one or more of creation and design, rolodex, exchange, and update features. In one embodiment, the information management and distribution system can include a networked server system accessible by remote user devices via the network, and at least one database maintained by the networked server system and storing content information and exchange settings of registered users.12-29-2011
20120016939METHOD AND SYSTEM FOR CONTROLLED DISTRIBUTION OF INFORMATION OVER A NETWORK - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.01-19-2012
20130013690Method and System for Controlled Distribution of Information Over a Network - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.01-10-2013
20130014281Method and System for Controlled Distribution of Information Over a Network - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.01-10-2013
20130014282Method and System for Controlled Distribution of Information Over a Network - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.01-10-2013
20130018983Method and System for Controlled Distribution of Information Over a Network - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.01-17-2013
20130031193Method and System for Controlled Distribution of Information Over a Network - An information management and distribution system is disclosed. The information management and distribution system includes a client-side application and a server application that interact to facilitate the controlled exchange of contact information over a network. The client-side application can provide creation and design, rolodex, exchange, and update features. The information management and distribution system can also include a corporate administrator application. Still another aspect of the invention is that contact information can be distributed to registered users in a common format.01-31-2013

Patent applications by Chris Cheah, San Jose, CA US

Chuan Cheah, Redondo Beach, CA US

Patent application numberDescriptionPublished
20080237829High current lead electrode for semiconductor device - A semiconductor package that includes a lead frame riveted to pillars electrically connect to an electrode of a semiconductor die.10-02-2008
20090072368PACKAGE FOR MONOLITHIC COMPOUND SEMICONDUCTOR (CSC) DEVICES FOR DC TO DC CONVERTERS - A multichip module defining a dc to dc converter employs a monolithic chip containing at least two III-nitride switches (a monolithic CSC chip) mounted on a conductive lead frame. The CSC chip is copacked with an IC driver for the switches and with the necessary passives. The module defines a buck converter; a boost converter, a buck boost converter, a forward converter and a flyback converter. The drain, source and gate pads of the monolithic CSC chip are connected to a lead frame by solder or epoxy or by bumping attach and a conductive connector or wire bonds connect the switch terminal to lead frame.03-19-2009
20110108968Semiconductor package with metal straps - A copper strap for a semiconductor device package having a contact electrically connected to a die electrode, a leg portion electrically connected to a lead frame, a web portion positioned between the contact and the leg portion and connected to the leg portion and a connection region connecting the web portion to the contact. The contact includes a body having a plurality of formations, each of the plurality of formations having a concavity and an opposing convexity positioned to generally face the die electrode.05-12-2011
20110272705Interdigitated Conductive Support for GaN Semiconductor Die - A GaN die having a plurality of parallel alternating and closely spaced source and drain strips is contacted by parallel coplanar comb-shaped fingers of source and drain pads. A plurality of enlarged area coplanar spaced gate pads having respective fingers contacting the gate contact of the die. The pads may be elements of a lead frame, or conductive areas on an insulation substrate. Other semiconductor die can be mounted on the pads and connected in predetermined circuit arrangements with the GaN die.11-10-2011

Patent applications by Chuan Cheah, Redondo Beach, CA US

Chuan Cheah, Torrance, CA US

Patent application numberDescriptionPublished
20110198611III-Nitride Power Device with Solderable Front Metal - Some exemplary embodiments of a III-nitride power device including a HEMT with multiple interconnect metal layers and a solderable front metal structure using solder bars for external circuit connections have been disclosed. The solderable front metal structure may comprise a tri-metal such as TiNiAg, and may be configured to expose source and drain contacts of the HEMT as alternating elongated digits or bars. Additionally, a single package may integrate multiple such HEMTs wherein the front metal structures expose alternating interdigitated source and drain contacts, which may be advantageous for DC-DC power conversion circuit designs using III-nitride devices. By using solder bars for external circuit connections, lateral conduction is enabled, thereby advantageously reducing device Rdson.08-18-2011
20120168922High Power Semiconductor Package with Conductive Clip - One exemplary disclosed embodiment comprises a high power semiconductor package configured as a buck converter having a control transistor, a sync transistor, a driver integrated circuit (IC) for driving the control and sync transistors, and a conductive clip electrically coupling a sync drain of the sync transistor to a first leadframe pad of the package, wherein the first leadframe pad of the package is electrically coupled to a control source of the control transistor using a wirebond. The conductive clip provides an efficient connection between the control source and the sync drain by direct mechanical connection and large surface area conduction. A sync source is electrically and mechanically coupled to a second leadframe pad providing a high current carrying capability, and high reliability. The resulting package has significantly reduced electrical resistance, form factor, complexity, and cost when compared to conventional packaging methods using wirebonds for transistor interconnections.07-05-2012
20120168923High Power Semiconductor Package with Conductive Clip on Multiple Transistors - One exemplary disclosed embodiment comprises a high power semiconductor package configured as a buck converter having a control transistor, a sync transistor, a driver integrated circuit (IC) for driving the control and sync transistors, and a conductive clip extending from a sync drain on a top surface of the sync transistor to a control source on a top surface of the control transistor. The conductive clip may also connect to substrate pads such as a leadframe pad for current input and output. In this manner, the conductive clip provides an efficient connection between the control source and the sync drain by direct mechanical connection and large surface area conduction, thereby enabling a package with significantly reduced electrical resistance, form factor, complexity, and cost when compared to conventional packaging methods using wirebonds for transistor interconnections.07-05-2012
20120168924High Power Semiconductor Package with Multiple Conductive Clips - One exemplary disclosed embodiment comprises a high power semiconductor package configured as a buck converter having a control transistor and a sync transistor disposed on a common leadframe pad, a driver integrated circuit (IC) for driving the control and sync transistors, and conductive clips electrically coupling the top surfaces of the transistors to substrate pads such as leadframe pads. In this manner, the leadframe and the conductive clips provide efficient grounding or current conduction by direct mechanical connection and large surface area conduction, thereby enabling a package with significantly reduced electrical resistance, form factor, complexity, and cost when compared to conventional packaging methods using wirebonds for transistor interconnections.07-05-2012
20120168925High Power Semiconductor Package with Conductive Clips and Flip Chip Driver IC - One exemplary disclosed embodiment comprises a high power semiconductor package configured as a buck converter having a control transistor and a sync transistor disposed on a leadframe, a flip chip driver integrated circuit (IC) for driving the control and sync transistors, and conductive clips electrically coupling the top surfaces of the transistors to substrate pads such as leadframe pads. The source of the control transistor is electrically coupled to the drain of the sync transistor using the leadframe and one of the transistor conductive clips. In this manner, the leadframe and the conductive clips provide efficient current conduction by direct mechanical connection and large surface area conduction, thereby enabling a package with significantly reduced electrical resistance, form factor, complexity, and cost when compared to conventional packaging methods using wirebonds for transistor interconnections.07-05-2012
20120168926High Power Semiconductor Package with Conductive Clip and Flip Chip Driver IC with Integrated Control Transistor - One exemplary disclosed embodiment comprises a high power semiconductor package configured as a buck converter having a sync transistor with a top surface having a drain, a flip chip driver integrated circuit (IC) having an integrated control transistor, the flip chip driver IC driving the sync and control transistors, and a conductive clip electrically coupling the drain of the sync transistor to a common portion of the leadframe shared with a control source of the control transistor. In this manner, the leadframe and the conductive clip provide efficient current conduction by direct mechanical connection and large surface area conduction, significantly reducing package electrical resistance, form factor, complexity, and cost compared to conventional packages. Moreover, by integrating only the control transistor rather than both the control and sync transistor within the flip chip driver IC, the sync transistor may remain separate, simplifying manufacture and providing greater total surface area for thermal dissipation.07-05-2012
20120181624Stacked Half-Bridge Package with a Common Conductive Clip - According to an exemplary embodiment, a stacked half-bridge package includes a control transistor having a control drain for connection to a high voltage input, a control source coupled to a common conductive clip, and a control gate for being driven by a driver IC. The stacked half-bridge package also includes a sync transistor having a sync drain for connection to the common conductive clip, a sync source coupled to a low voltage input, and a sync gate for being driven by the driver IC. The control and sync transistors are stacked on opposite sides of the common conductive clip with the common conductive clip electrically and mechanically coupling the control source with the sync drain, where the common conductive clip has a conductive leg for providing electrical and mechanical connection to an output terminal leadframe.07-19-2012
20120181674Stacked Half-Bridge Package with a Common Conductive Leadframe - According to an exemplary embodiment, a stacked half-bridge package includes a control transistor having a control drain for connection to a high voltage input, a control source coupled to an output terminal, and a control gate for being driven by a driver IC. The stacked half-bridge package further includes a sync transistor having a sync drain for connection to the output terminal, a sync source coupled to a low voltage input, and a sync gate for being driven by the driver IC. The control and sync transistors are stacked on opposite sides of a common conductive leadframe with the common conductive leadframe electrically and mechanically coupling the control source with the sync drain. The common conductive leadframe thereby serves as the output terminal.07-19-2012
20120181681Stacked Half-Bridge Package with a Current Carrying Layer - According to an exemplary embodiment, a stacked half-bridge package includes a control transistor having a control drain for connection to a high voltage input, a control source coupled to an output terminal, and a control gate for being driven by a driver IC. The stacked half-bridge package also includes a sync transistor having a sync drain for connection to the output terminal, a sync source coupled to a low voltage input, and a sync gate for being driven by the driver IC. A current carrying layer is situated on the sync drain; the control transistor and the sync transistor being stacked on one another, where the current carrying layer provides a high current connection between the sync drain and the control source.07-19-2012
20120280245High Voltage Cascoded III-Nitride Rectifier Package with Stamped Leadframe - Some exemplary embodiments of high voltage cascoded III-nitride semiconductor package with a stamped leadframe have been disclosed. One exemplary embodiment comprises a III-nitride transistor having an anode of a diode stacked atop a source of the III-nitride transistor, and a stamped leadframe comprising a first bent lead coupled to a gate of the III-nitride transistor and the anode of the diode, and a second bent lead coupled to a drain of the III-nitride transistor. The bent leads expose respective flat portions that are surface mountable. In this manner, reduced package footprint, improved surge current capability, and higher performance may be achieved compared to conventional wire bonded packages. Furthermore, since multiple packages may be assembled at a time, high integration and cost savings may be achieved compared to conventional methods requiring individual package processing and externally sourced parts.11-08-2012
20120280246High Voltage Cascoded III-Nitride Rectifier Package with Etched Leadframe - Some exemplary embodiments of high voltage cascaded III-nitride semiconductor package with an etched leadframe have been disclosed. One exemplary embodiment comprises a III-nitride transistor having an anode of a diode stacked over a source of the III-nitride transistor, and a leadframe that is etched to form a first leadframe paddle portion coupled to a gate of the III-nitride transistor and the anode of the diode, and a second leadframe paddle portion coupled to a drain of the III-nitride transistor. The leadframe paddle portions enable the package to be surface mountable. In this manner, reduced package footprint, improved surge current capability, and higher performance may be achieved compared to conventional wire bonded packages. Furthermore, since multiple packages may be assembled at a time, high integration and cost savings may be achieved compared to conventional methods requiring individual package processing and externally sourced parts.11-08-2012
20120280247High Voltage Cascoded III-Nitride Rectifier Package Utilizing Clips on Package Support Surface - Some exemplary embodiments of high voltage cascoded III-nitride semiconductor package utilizing clips on a package support surface have been disclosed. One exemplary embodiment comprises a III-nitride transistor attached to a package support surface and having an anode of a diode stacked over a source of the III-nitride transistor, a first conductive clip coupled to a gate of the III-nitride transistor and the anode of the diode, and a second conductive clip coupled to a drain of the III-nitride transistor. The conductive clips are connected to the package support surface and expose respective flat portions that are surface mountable. In this manner, reduced package footprint, improved surge current capability, and higher performance may be achieved compared to conventional wire bonded packages. Furthermore, since a low cost printed circuit board (PCB) may be utilized for the package support surface, expensive leadless fabrication processes may be avoided for cost effective manufacturing.11-08-2012

Ming Tatt Cheah, Palo Alto, CA US

Patent application numberDescriptionPublished
20100184810METHODS AND COMPOSITIONS RELATED TO RIBOSWITCHES THAT CONTROL ALTERNATIVE SPLICING - Disclosed are methods and compositions related to riboswitches that control alternative splicing.07-22-2010