Cheung; William S. H.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Cheung; William S. H..The latest application filed is for "air purifier having an electret module".

Company Profile

0.19.12

Cheung; William S. H. - London GB
Cheung; William S. H. - London NW11 8QY GB
Cheung; William S H - Golders Green London NW11 60Y GB
Cheung; William S. H. - Hong Kong HK

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Air purifier having an electret module Grant 10,675,489 - Cheung	2020-06-09
System and method for electret surface potential restoration by a directional pulsating electric field Grant 10,522,295 - Cheung Dec	2019-12-31
Electronic component fabrication method using removable spacers Grant 10,141,124 - Cheung Nov	2018-11-27
Air Purifier Having An Electret Module App 20180193678 - Cheung; William S.H.	2018-07-12
System And Method For Electret Surface Potential Restoration By A Directional Pulsating Electric Field App 20180102221 - Cheung; William S.H.	2018-04-12
Air purifier having an electret module Grant 9,913,998 - Cheung March 13, 2	2018-03-13
System and method for electret surface potential restoration by a directional pulsating electric field Grant 9,842,701 - Cheung December 12, 2	2017-12-12
Electronic Component Fabrication Method Using Removable Spacers App 20170076876 - CHEUNG; WILLIAM S.H.	2017-03-16
Electronic component fabrication method using removable spacers Grant 9,508,490 - Cheung November 29, 2	2016-11-29
Planar electrodes and a method of controlling spacing between electrodes Grant 9,230,736 - Cheung January 5, 2	2016-01-05
System And Method For Electret Surface Potential Restoration By A Directional Pulsating Electric Field App 20150022028 - CHEUNG; William S.H.	2015-01-22
Electronic Component Fabrication Method Using Removable Spacers App 20140233151 - CHEUNG; WILLIAM S.H.	2014-08-21
Air Purifier Having An Electret Module App 20140150797 - Cheung; William S.H.	2014-06-05
Electronic component fabrication method using removable spacers Grant 8,732,925 - Cheung May 27, 2	2014-05-27
Electronic Component Fabrication Method Using Removable Spacers App 20120194964 - Cheung; William S. H.	2012-08-02
Planar Electrodes And A Method Of Controlling Spacing Between Electrodes App 20120118611 - Cheung; William S. H.	2012-05-17
Electronic component fabrication method using removable spacers Grant 8,156,622 - Cheung April 17, 2	2012-04-17
Device and method for making air, gas or vacuum capacitors and other microwave components Grant 7,387,928 - Cheung June 17, 2	2008-06-17
Device And Method For Making Air, Gas Or Vacuum Capacitors And Other Microwave Components App 20070281421 - Cheung; William S. H.	2007-12-06
Electronic insect repelling device App 20060198245 - Cheung; William S.H.	2006-09-07
Micro-gap gas filled dielectric capacitor Grant 6,775,124 - Cheung August 10, 2	2004-08-10
Micro-gap gas filled dielectric capacitor App 20030095371 - Cheung, William S.H.	2003-05-22
Apparatus for encoding and decoding information Grant 4,527,195 - Cheung July 2, 1	1985-07-02
Vehicle ignition system Grant 4,438,752 - Cheung March 27, 1	1984-03-27
Transmitting and receiving apparatus for permitting the transmission and reception of multi-tier subscription programs Grant 4,430,669 - Cheung February 7, 1	1984-02-07
Apparatus for encoding of information Grant 4,396,947 - Cheung August 2, 1	1983-08-02
Apparatus for encoding of information Grant 4,329,711 - Cheung May 11, 1	1982-05-11

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