Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
CT

Ching Hwa Tsang — 71 Patents

IBM: 39 patents #2,426 of 70,183Top 4%
HGHGST: 27 patents #45 of 1,677Top 3%
HBHgst Netherlands, B.V.: 2 patents #341 of 972Top 40%
STSandisk Technologies: 1 patents #1,739 of 2,594Top 70%
WTWestern Digital Technologies: 1 patents #1,874 of 3,180Top 60%
Sunnyvale, CA: #186 of 14,302 inventorsTop 2%
California: #4,357 of 386,348 inventorsTop 2%
Overall (All Time): #28,405 of 4,157,543Top 1%
71 Patents All Time
Ching Hwa Tsang has been granted 71 US patents while listed as an inventor at IBM. The first was granted in 1985 and the most recent in April 2018. Ching Hwa Tsang ranks #28,405 of 4,157,543 US inventors in our database (top 0.68%). Patent records list Ching Hwa Tsang in Sunnyvale, CA, US.

Patents per Year

Patents granted per year, 1985 to 2018Bar chart with a peak of 7 patents in 2008.peak 71985: 1 patents19851987: 1 patents1988: 1 patents1989: 1 patents19891993: 2 patents1994: 3 patents1995: 4 patents19951996: 5 patents1997: 4 patents1999: 5 patents19992000: 4 patents2001: 2 patents2002: 1 patents20022003: 2 patents2004: 2 patents2005: 4 patents20052006: 1 patents2007: 3 patents2008: 7 patents20082009: 5 patents2010: 7 patents2011: 1 patents20112012: 1 patents2014: 1 patents2015: 1 patents20152018: 2 patents2018

Issued Patents All Time

Showing 1–25 of 71 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
9953692 Spin orbit torque MRAM memory cell with enhanced thermal stability Goran Mihajlovic 2018-04-24
9940955 Tunnel magnetoresistance magnetic sensor with scissor sensor and multi-seed layer configuration Kouichi Nishioka, Zheng Gao, Quang Le, Sangmun Oh 2018-04-10 $13,932,000
9001473 TMR/CPP reader for narrow reader gap application Zheng Gao, James Mac Freitag, Kuok San Ho, Kochan Ju 2015-04-07
8780507 Read transducer and magnetic storage system implementing same Ying Hong, Kochan Ju 2014-07-15
8325450 Low resistance tunnel magnetoresistance (TMR) structure Ying Hong, Kochan Ju, Tsann Lin 2012-12-04
8018765 Three-dimensional magnetic memory Robert E. Fontana, Jr., Andreas Moser, Hal J. Rosen, Bruce David Terris 2011-09-13 $169,000
7821822 Read/write elements for a three-dimensional magnetic memory Robert E. Fontana, Jr., Jordan Asher Katine, Barry Cushing Stipe, Bruce David Terris 2010-10-26 $96,000
7768748 Magnetoresistive sensor with overlaid combined leads and shields Kuok San Ho, Edward Pong Lee, David J. Seagle 2010-08-03 $61,000
7764469 Notched shield and pole structure with slanted wing for perpendicular recording Kuok San Ho, Yimin Hsu 2010-07-27 $109,000
7697246 Magnetoresistive sensor having biasing AFM layer in contact with free layer and a track width defined by a lead contact area James Mac Freitag, Kuok San Ho, Mustafa Pinarbasi 2010-04-13 $72,000
7663846 Magnetoresistive sensor having an enhanced lead overlay design and shape enhanced pinning James Mac Freitag, Kuok San Ho, Mustafa Pinarbasi 2010-02-16 $54,000
7652855 Magnetic sensor with extended free layer and overlaid leads James Mac Freitag, David Heim, Kuok San Ho, Wipul Pemsiri Jayasekara, Kim Y. Lee +3 more 2010-01-26 $75,000
7649711 Double notched shield and pole structure for stray field reduction in a magnetic head Kuok San Ho, Yimin Hsu 2010-01-19 $102,000
7616403 Winged design for reducing corner stray magnetic fields Kuok San Ho, Yimin Hsu, Masafumi Mochizuki, Roger William Wood 2009-11-10 $81,000
7606065 Three-dimensional magnetic memory having bits transferrable between storage layers Robert E. Fontana, Jr., Andreas Moser, Hal J. Rosen, Bruce David Terris 2009-10-20 $78,000
7580230 Magnetoresistive sensor having shape enhanced pinning, a flux guide structure and damage free virtual edges James Mac Freitag, Kuok San Ho, Mustafa Pinarbasi 2009-08-25 $138,000
7522391 Current perpendicular to plane magnetoresistive sensor having a shape enhanced pinned layer and an in stack bias structure James Mac Freitag, Kuok San Ho, Mustafa Pinarbasi 2009-04-21 $88,000
7497008 Method of fabricating a thin film magnetic sensor on a wafer Tsung-Yuan Chen, Frederick Dill, James Mac Freitag, Kuok San Ho, Wipul Pemsiri Jayasekara +3 more 2009-03-03 $108,000
7463459 Self-pinned read sensor design with enhanced lead stabilizing mechanism Meng Ding, Robert E. Fontana, Jr., Kuok San Ho, Neil Leslie Robertson 2008-12-09 $138,000
7420787 Magnetoresistive sensor having a shape enhanced pinned layer James Mac Freitag, Kuok San Ho, Mustafa Pinarbasi 2008-09-02 $222,000
7414816 Planar magnetic thin film head Robert E. Fontana, Jr., Kuok San Ho 2008-08-19 $272,000
7388776 Three-dimensional magnetic memory Robert E. Fontana, Jr., Andreas Moser, Hal J. Rosen, Bruce David Terris 2008-06-17 $482,000
7369371 Magnetoresistive sensor having a shape enhanced pinned layer James Mac Freitag, Kuok San Ho, Mustafa Pinarbasi 2008-05-06 $206,000
7324313 Read sensor having an in-stack biasing structure and an AP coupled free layer structure for increased magnetic stability Jeffrey R. Childress, Robert E. Fontana, Jr., Kuok San Ho 2008-01-29 $239,000
7317596 Magnetic recording disk drive having read head with high cross-track resolution and disk with low bit-aspect-ratio Thomas R. Albrecht, Robert E. Fontana, Jr., Mason Williams, Bruce A. Wilson 2008-01-08 $396,000