Inventors list |
Assignees list |
Classification tree browser |
Top 100 Inventors |
Top 100 Assignees |
Tieu
Andrew Tieu, Ottawa CA
| Patent application number | Description | Published |
|---|---|---|
| 20090308948 | Ultrasonic Waterjet Apparatus - An ultrasonic waterjet apparatus ( | 12-17-2009 |
| 20110089251 | Ultrasonic Waterjet Apparatus - An ultrasonic waterjet apparatus ( | 04-21-2011 |
| 20120061485 | Ultrasonic Waterjet Apparatus - An ultrasonic waterjet apparatus has a mobile generator module and a high-pressure water hose for delivering high-pressure water from the mobile generator module to a hand-held gun with a trigger and an ultrasonic nozzle. An ultrasonic generator transmits high-frequency electrical pulses to a piezoelectric or magnetostrictive transducer which vibrates to modulate a high-pressure waterjet flowing through the nozzle. The waterjet exiting the ultrasonic nozzle is pulsed into mini slugs of water. The ultrasonic waterjet apparatus may be used to cut and de-burr materials, to clean and de-coat surfaces, and to break rocks. The ultrasonic waterjet apparatus performs these tasks with much greater efficiency than conventional continuous-flow waterjet systems because of the repetitive waterhammer effect. A nozzle with multiple exit orifices or a rotating nozzle may be provided in lieu of a nozzle with a single exit orifice to render cleaning and de-coating large surfaces more efficient. | 03-15-2012 |
Andrew Hung Tieu, Ottawa CA
| Patent application number | Description | Published |
|---|---|---|
| 20100015892 | METHOD AND APPARATUS FOR PREPPING SURFACES WITH A HIGH-FREQUENCY FORCED PULSED WATERJET - A method of prepping a surface using a high-frequency forced pulsed waterjet entails generating a high-frequency signal having a frequency f using a high-frequency signal generator, applying the high-frequency signal to a transducer having a microtip to cause the microtip of the transducer to vibrate to thereby generate a forced pulsed waterjet through an exit orifice of a nozzle having an exit orifice diameter d and a length L. The forced pulsed waterjet prepares the surface to within a predetermined range of surface roughness. The surface roughness is determined by selecting operating parameters comprising a standoff distance (SD), a traverse velocity V | 01-21-2010 |
Elaine Tieu, Langford AU
| Patent application number | Description | Published |
|---|---|---|
| 20120258938 | Enzymatic Production or Chemical Synthesis and Uses for 5,7-Dienes and UVB Conversion Products Thereof - Provided herein are steroidal compounds that are androsta-5,7-dienes or pregna-5,7-dienes and ultraviolet B (UVB) conversion products thereof and cholecalciferol derivatives hydroxylated at one or more of C1, C17, C20, C23, C24, C25, and C26 which includes pharmaceutical, cosmeceutical or nutraceutical compositions of the steroidal compounds as shown in Tables 1A, 2A and 3. Also provided is a method for producing hydroxylated metabolites of cholecalciferol via CYP11A1, CYP24, CYP27A1, or CYP27B1 enzyme systems where the hydroxylase has an activity to hydroxylate position C1 or C20 or other position of the sidechain of a secosteroid or its 5,7-dieneal precursor and the hydroxylated metabolites so produced. Methods are provided for inhibiting proliferation of either a normally or abnormally proliferating cell, for modifying immune activity, or for treating a condition associated with the proliferating or quiescent cell or immune cells by contacting the cell with or administering any of the compounds described herein. | 10-11-2012 |
John Tieu, Fort Mcmurray CA
| Patent application number | Description | Published |
|---|---|---|
| 20130092608 | SCREEN CLOTH FOR VIBRATING OR STATIONARY SCREENS - An impact screen cloth for use in a screening device for screening out oversize objects in a material flowing in a direction is provided, comprising a metal plate having a perimeter and comprising a plurality of openings therethrough and forming a grid having longitudinal ligaments substantially parallel to the direction of the material flow and transverse ligaments substantially perpendicular to the direction of the material flow; and a number of longitudinal wear bars positioned on an equal number of longitudinal ligaments to cover a substantial portion of the number of longitudinal ligaments without substantially interfering with the openings. | 04-18-2013 |
Kinh Han Tieu, Boston, MA US
| Patent application number | Description | Published |
|---|---|---|
| 20110200255 | Method for Segmenting Images with Intensity-Based Label Propagation and Probabilistic of Level Sets - A method exploits user labels in image segmentation. The user labels are propagated with respect to image intensity information. Propagated user labels are included in a cost function of level set evolution. The level set represents a probability of the object segment. | 08-18-2011 |
Quang Chan Tieu, Richardson, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20120087648 | METHOD AND SYSTEM FOR PROTECTION SWITCHING - A method is provided for protection switching in an optical network. The method may include communicating a switch request for initiation of protection switching in response to a determination that at least a minimum frequency of interrupts indicating failure of an optical signal has occurred over a first period. The method may also include communicating a switch request for cessation of protection switching in response to a determination that no more than a maximum frequency of interrupts indicating failure of an optical signal has occurred over a second period. | 04-12-2012 |
| 20120230674 | Triggers to Fault Information Insertion in Optical Transport Network - Systems and methods for triggering fault information insertion in an optical network are disclosed. In accordance with certain embodiments of the present disclosure, a method may include detecting, by a network element, occurrence of an event. The network element may also determine whether the event comprises a triggering fault condition in which fault information is to be communicated. The network element may additionally insert fault information into a data packet. The network element may further communicate the data packet to at least one neighboring network element. | 09-13-2012 |
Triet Tieu, Frisco, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20090243521 | METHODS AND APPARATUS TO REDUCE THE STOPPING TIME OF SPINDLE MOTORS - Methods and apparatus to reduce the stopping time of a spindle motor are disclosed. An example method includes detecting a dissipation current flowing in a spinning motor; determining when the dissipation current drops below a threshold value; and, in response to the dissipation current dropping below the threshold value, applying a voltage to the motor to increase the dissipation current for a duration. In some examples, the voltage is removed from the motor when the motor reaches a predetermined rotational velocity to avoid reverse rotation. | 10-01-2009 |
Triet M. Tieu, Frisco, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20120319631 | SENSORLESS MOTOR CONTROL USING THE RATE OF CHANGE OF THE INDUCTIVE RISE TIME - A conventional method used for a startup mode for a brushless direct current (DC) motor employed complementary inductive rise times. Specifically, inductive rise times rise times for a driving state and its complementary state were compared to one another such that when the inductive rise times cross a switching point had been reached. This methodology, however, significantly affects the efficiency of the driving torque and power consumption. Here, however, a derivative of the inductive rise time is employed, which can determine the switching event without the need for a use of a complementary state, improving motor performance. | 12-20-2012 |
Triet Minh Tieu, Frisco, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20100157467 | Quiet Retraction System - A quiet retraction method for regulating constant velocity while parking an arm within a disk drive is described. The method comprises the steps of: driving a motor for the arm using a first drive current for a first period; floating the motor; sampling a back electromotive force (bemf) for a first sampled voltage, while floating the motor; driving the motor with a second drive current during a second period in response to sampling the bemf; determining whether the second drive current exceeds a current limit; estimating the bemf using the first sampled voltage when the second drive current exceeds the current limit; driving the motor with a third current during a third period in response to estimating the bemf; wherein driving the motor with the first, second, and third currents quietly parks the arm, while regulating the constant velocity. | 06-24-2010 |