Petrich
Curtis J. Petrich, Minneapolis, MN US
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20090303104 | PSEUDO-RANDOM PULSE INTERVAL GENERATION IN NAVIGATION-AIDING DEVICES - An electronic circuit comprises a randomizing bit generator configured to generate a randomizing bit sequence based on a sequence selection input signal. The randomizing bit generator includes a counter operable to provide an individual starting count for the randomizing bit sequence and a parity generator responsive to an output of the counter. The circuit further comprises a pseudo-random number generator responsive to the randomizing bit generator. The pseudo-random number generator is operable to provide at least one pulsed signal based at least in part on the random bit sequence. The electronic circuit is operable to substantially eliminate interference in a series of pulsed signal transmissions comprising the at least one pulsed signal from each of two or more navigation devices, where each of the pulsed signals from each of the navigation devices is separated by an automatically adjustable time interval. | 12-10-2009 |
Erik Petrich, Norman, OK US
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20110063577 | 3D Light Surface Display - A light surface display for providing a three-dimensional image including a plurality of particles suspended within a volumetric display. A first projection system projects sequential slices of electromagnetic energy of one or more wavelengths along the length and width of the volumetric display energizing particles to form a two-dimensional image. A second projection system projects translational slices of electromagnetic energy of one or more wavelengths that intersect with the energized particles across the depth of the volumetric display. A control system synchronizes the projection of the image source and the activation source such that the two-dimensional image and the translational slices energize the particles for a pre-determined length of time so that the particles illuminate to form an illuminated three-dimensional image. | 03-17-2011 |
20120044460 | 3D Volumetric Display - A light surface display for providing a three-dimensional image including a plurality of particles dispersed within a volumetric display. A first projection system projects sequential slices of electromagnetic energy of one or more infrared wavelengths along the length and width of the volumetric display energizing particles to form a two-dimensional image. A second projection system projects translational slices of electromagnetic energy of one or more infra-red wavelengths that intersect with the energized particles across the depth of the volumetric display. A control system synchronizes the projection of the image source and the activation source such that the two-dimensional image and the translational slices energize the particles for a pre-determined length of time so that the particles illuminate to form an illuminated three-dimensional image. | 02-23-2012 |
20120274907 | 3D Volumetric Display - A light surface display for providing a three-dimensional image having a volumetric display, a first projection system, and a second projection system. The first projection system projects electromagnetic energy into the volumetric display sequentially along the length and width of the volumetric display in a series of 2D image slices. The second projection system projects electromagnetic energy in a series of slices along the depth of the volumetric display. Particles intersected by the first and second wavelengths form illuminated two-dimensional cross sections at specific locations in the volumetric display. | 11-01-2012 |
Gale S. Petrich, Arlington, MA US
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20100054656 | SEMICONDUCTOR-BASED BROADBAND MODULATORS - An optical modulator is provided. The optical modulator includes a ridge-shaped active region comprising a plurality of alternating high and low index layers. The ridge-shaped active region is used to confine a selective optical mode for optical modulation. A plurality of oxidized layers positioned so as to confine the selective optical mode in the middle region of the ridge-shaped active region. The oxidized layers enable the optical modulator to withstand high operating voltages both in reverse and forward bias without concern of breakdown or carrier loss. | 03-04-2010 |
Jacob W. Petrich, Ames, IA US
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20100159505 | REAL-TIME MONITORING OF AGE PIGMENTS AND FACTORS RELATING TO TRANSMISSIBLE SPONGIFORM ENCEPHALOPATHIES AND APPARATUS - A fluorescent spectroscopic method and apparatus for real time direct detection of transmissible spongiform encephalopathies in central nervous system tissue by monitoring the fluorescence of intrinsic markers in the tissue by illuminating the tissue with UV or visible light having an appropriate wavelength, and the resulting emission spectra is detected and examined in the region from 350 to 650 nm. A higher intensity in this region is indicative of infected tissue. The apparatus and method would not interfere with existing slaughterhouse line speeds or procedures, and could be used on live animals. | 06-24-2010 |
Kyle L. Petrich, New York, NY US
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20100037739 | Power cutting tool with overhead sensing system - A power cutting tool, such as a table saw, comprising a sensing system for detecting certain conditions with respect to an exposed blade of the power cutting tool is disclosed. Several embodiments of the sensing system comprise at least one sensor located above the blade and positioned to (1) monitor one or more volume zones adjacent the blade, (2) detect when an object enters one or more of the zones, and (3) trigger a reaction system in response to the detection. Another embodiment uses an optical sensor to measure the height of objects approaching the blade to detect an increase in the height beyond a predetermined threshold. Still another embodiment uses an optical distance sensor to detect the occurrence of a work piece lifting from the table top which can indicate that a kick-back condition is imminent. The reaction system can be triggered when such a condition is detected. | 02-18-2010 |
Mark A. Petrich, West Point, PA US
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20150360815 | PHASE-CHANGE ACCOMMODATING RIGID FLUID CONTAINER - The phase-change accommodating rigid fluid container disclosed herein includes a variety of features that protect the container from phase changes of a fluid stored therein. As a result, the container may be in direct contact with the fluid without any flexible membrane or bag there between. For example, the fluid container may include one or more of matched pairs of recesses for physical manipulation of the container, stiffening ribs extending between the recesses, and input/output assemblies acting as inputs for fluid into the container, outputs of fluid from the container, and vents for pressure equalization of the container. | 12-17-2015 |
Michael J. Petrich, Lake Elmo, MN US
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20110228391 | PROTECTIVE OVERLAY BEARING A GRAPHIC AND RETROREFLECTIVE ARTICLES COMPRISING THE OVERLAY - A transfer article, a retroreflective article and methods of making the same. The transfer article can include an overlay. The retroreflective article can include an optical layer and an overlay. The optical layer can include a front surface and a rear surface, and can include retroreflective optical elements. The overlay can include a front surface and a rear surface adapted to be coupled to the front surface of a substrate, such as the optical layer. The overlay can further include a graphic, such that the graphic is buried with respect to the front surface of the overlay. A method of making the retroreflective article can include applying a graphic to the rear surface of the overlay, and coupling the overlay bearing the graphic to the front surface of a substrate, such as the optical layer. | 09-22-2011 |
Nicole Petrich, Seattle, WA US
Peter Petrich, Klosterneuburg AT
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20110127216 | METHOD AND DEVICE FOR BIOLOGICAL TREATMENT OF WATER IN SWIMMING POOLS - The invention relates to a method for biological treatment of water in swimming pools. The method requires neither chlorine nor other toxic chemicals in the pool water, since near-surface pool water is mechanically purified in a first water circuit and suspended matter situated in the pool water is first retained in a biological filter ( | 06-02-2011 |
Tessa Petrich, San Francisco, CA US
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20140380246 | SYSTEMS AND METHODS FOR MULTI-LAYER USER CONTENT NAVIGATION - Systems and methods are disclosed for providing navigation control across multiple layers of content views within a mobile application. One method includes: providing a first layer of content views that are each selectable by a user for display via a graphical user interface of an application executable at a mobile device; responsive to receiving user input selecting at least one of the content views in the first layer, obtaining content views for a second layer corresponding to the content view selected in the first layer; and enabling the user to navigate between the content views in the first layer and corresponding content views in the second layer via the graphical user interface; wherein content views obtained for the second layer are automatically updated with content views corresponding to a currently selected content view in the first layer. | 12-25-2014 |