Patents by Inventor Edward K. Chan
Edward K. Chan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11911272Abstract: Various aspects of the present disclosure are directed toward apparatuses, systems, and methods that include a plurality of absorbable filaments arranged in a support structure and configured degrade within a defined time period and a membrane arranged about the plurality of absorbable filaments and configured to contain fragments of the plurality of absorbable filaments in response to a fracture or degradation of a filament.Type: GrantFiled: January 17, 2020Date of Patent: February 27, 2024Assignee: W. L. Gore & Associates, Inc.Inventors: Michael C. Chan, Edward H. Cully, Jeffrey B. Duncan, Byron K. Hayes, Samuel Joynson, Tom R. McDaniel, David J. Messick, Edward E. Shaw
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Patent number: 9035934Abstract: This disclosure provides systems, methods and apparatus for driving three-terminal electromechanical systems (EMS) devices. The driving systems and methods described herein include a switched capacitor charge injection circuit that is configured to isolate a single EMS device and transfer a desired amount of charge to the isolated device such that the device can be actuated to produce a desired optical, electrical or mechanical effect. The charge injection circuit can include an operational amplifier and can be connected such that the EMS device is placed in the feedback path of the operational amplifier.Type: GrantFiled: May 2, 2012Date of Patent: May 19, 2015Assignee: QUALCOMM MEMS Technologies, Inc.Inventors: Edward K. Chan, John H. Hong, Cheonhong Kim, Chong U. Lee, Bing Wen
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Patent number: 9030391Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for accurately positioning a movable conductive layer of a reflective display element. In one aspect, an initial position of the movable conductive layer with respect to at least one or more fixed conductive layers is sensed. A charging voltage may be determined based at least in part on the initial position. The charging voltage may be applied to the movable conductive layer.Type: GrantFiled: November 30, 2011Date of Patent: May 12, 2015Assignee: QUALCOMM MEMS Technologies, Inc.Inventors: John H. Hong, Chong U. Lee, Cheonhong Kim, Edward K. Chan
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Patent number: 8901971Abstract: Systems and methods for providing differential line drivers include a device having an input configured to receive an input signal and a driver circuit configured to generate a first output and a second output from the input signal. The second output is a complementary output to the first output, wherein the first output has a first transfer characteristic and the second output has a second transfer characteristic different than the first transfer characteristic. The first and second transfer characteristics include an offset from respective input values of the input signal. The device further includes an output configured to output as a differential signal the first output and the second output generated by the driver circuit, wherein the offset in the first and second transfer characteristics defines a fail-safe output state for the differential signal.Type: GrantFiled: October 14, 2013Date of Patent: December 2, 2014Assignee: The Boeing CompanyInventor: Edward K. Chan
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Publication number: 20140267443Abstract: This disclosure provides systems, methods and apparatus for increasing a range of stable travel positions of a movable layer within electromechanical systems (EMS) devices. In one aspect, an electrically isolated floating electrode can be disposed between a driving electrode within a movable layer and a fixed electrode in order to increase a stable travel range of the movable layer. By segmenting the electrically isolated floating electrode into multiple isolated electrode segments, unbalanced charge accumulation in response to tilting of the movable layer can be constrained to further increase the stable travel range of the movable layer.Type: ApplicationFiled: March 14, 2013Publication date: September 18, 2014Applicant: QUALCOMM MEMS Technologies, Inc.Inventors: Edward K. Chan, John H. Hong, Chong U. Lee, Isak C. Reines
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Publication number: 20140063022Abstract: This disclosure provides systems, methods and apparatus for electromechanical systems devices including one or more storage capacitors. In one aspect, a device includes a substrate structure, a movable element configured to move relative to the substrate structure, and at least one switch. The movable element includes a first conductive layer and a second conductive layer that form a storage capacitor. The switch is configured to control a flow of charge between a source and the storage capacitor.Type: ApplicationFiled: August 31, 2012Publication date: March 6, 2014Applicant: Qualcomm Mems Technologies, Inc.Inventors: Edward K. Chan, Bing Wen, Cheonhong Kim, John H. Hong
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Publication number: 20130293523Abstract: This disclosure provides systems, methods and apparatus for driving three-terminal electromechanical systems (EMS) devices. The driving systems and methods described herein include a switched capacitor charge injection circuit that is configured to isolate a single EMS device and transfer a desired amount of charge to the isolated device such that the device can be actuated to produce a desired optical, electrical or mechanical effect. The charge injection circuit can include an operational amplifier and can be connected such that the EMS device is placed in the feedback path of the operational amplifier.Type: ApplicationFiled: May 2, 2012Publication date: November 7, 2013Applicant: QUALCOMM MEMS Technologies, Inc.Inventors: Edward K. Chan, John H. Hong, Cheonhong Kim, Chong U. Lee, Bing Wen
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Publication number: 20130293556Abstract: Interferometric modulators may include a movable layer including both permanently anchored and programmable hinges. Unactuated programmable hinges may exert little or no force on the movable layer. When actuated, programmable hinges may exert a mechanical force on the movable layer in a direction approximately opposite to the direction of force exerted by the permanently anchored hinges. By increasing a voltage between the programmable hinges and an electrode, a progressive number of programmable hinges may be engaged. The mechanical force exerted on the movable layer by these hinges may change the relative position of the movable layer within an IMOD device.Type: ApplicationFiled: May 3, 2012Publication date: November 7, 2013Applicant: QUALCOMM MEMS Technologies, Inc.Inventors: Edward K. Chan, John H. Hong, Bing Wen
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Publication number: 20130135705Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for accurately positioning a movable conductive layer of a reflective display element. In one aspect, an initial position of the movable conductive layer with respect to at least one or more fixed conductive layers is sensed. A charging voltage may be determined based at least in part on the initial position. The charging voltage may be applied to the movable conductive layer.Type: ApplicationFiled: November 30, 2011Publication date: May 30, 2013Applicant: QUALCOMM MEMS Technologies, Inc.Inventors: John H. Hong, Chong U. Lee, Cheonhong Kim, Edward K. Chan
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Publication number: 20100194419Abstract: A multi-contact probe assembly may include a housing, a plurality of probe members, a plurality of spring members, and a plurality of electrical connectors. The housing may comprise a plurality of shafts in a pre-determined pattern. The plurality of probe members may be partially and moveably disposed within the plurality of shafts. The plurality of spring members may be disposed within the plurality of shafts spring-loading the probe members to partially and moveably extend beyond the plurality of shafts out of the housing in the pre-determined pattern. The plurality of electrical connectors may extend into the plurality of shafts for communicating signals from electrical testing equipment to the probe members. The pre-determined pattern may be substantially identical to a pattern of contacts on a circuit board being tested by the multi-contact probe assembly.Type: ApplicationFiled: February 5, 2009Publication date: August 5, 2010Inventors: Edward K. Chan, Robert H. Okita