Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
TC

Thomas Young Chang

STSeagate Technology: 42 patents #82 of 4,626Top 2%
IBM: 24 patents #4,429 of 70,183Top 7%
USUmax Data Systems: 19 patents #3 of 119Top 3%
P2Paragon 28: 14 patents #13 of 52Top 25%
HGHGST: 3 patents #567 of 1,677Top 35%
W(Western Digital (Fremont): 1 patents #299 of 473Top 65%
California: #2,061 of 386,348 inventorsTop 1%
Overall (All Time): #13,369 of 4,157,543Top 1%
104 Patents All Time

Issued Patents All Time

Showing 51–75 of 104 patents

Patent #TitleCo-InventorsDate
9147421 Enlarged substrate for magnetic recording medium Koji Adachi, Ian J. Beresford, Kuo Hsing Hwang, Jim Hennessy, David Perez 2015-09-29
9117863 Cassette configurations to support platters having different diameters David V. Dougherty, Ian J. Beresford, Donald E. Curtiss 2015-08-25
D720457 Calcaneo-cuboid bone wedge Frank S. Bono, Albert Dacosta 2014-12-30
D720456 Lapidus bone wedge Albert Dacosta 2014-12-30
8896964 Enlarged substrate for magnetic recording medium Koji Adachi, Ian J. Beresford, Kuo Hsing Hwang, Jim Hennessy, David Perez 2014-11-25
8628867 Patterned template with 1xN nucleation site to grain growth for uniform grain size recording media Shuaigang Xiao, Yingguo Peng, David S. Kuo, Kaizhong Gao, Thomas P. Nolan +1 more 2014-01-14
D695402 Lapidus cut guide Albert Dacosta 2013-12-10
D691272 Evans calcaneal bone wedge Albert Dacosta, Michael Houghton 2013-10-08
7259934 Pole tip trimmed magnetic recording head with minimal edge rounding Michael Andrew Parker 2007-08-21
6943993 Magnetic recording head with a side shield structure for controlling side reading of thin film read sensor Yingjian Chen, Jing Zhang, Heng Gong 2005-09-13
6788489 Employing off-track capability in data access operations in a direct access storage device Louis J. Serrano 2004-09-07
6747850 Merged magnetic head with a first pole piece notching layer Edward Hinpong Lee, Jyh-Shuey Lo 2004-06-08
6725527 Method of making a magnetic head assembly having open yoke write head with highly defined narrow track width Glen Adam Garfunkel, Edward Hin Pong Lee, Neil Leslie Robertson, Samuel Wonder Yuan 2004-04-27
6683759 First pole piece of a write head with a notching layer in a combined magnetic head Edward Hinpong Lee, Jhy-Shuey Jerry Lo 2004-01-27
6651313 Method for manufacturing a magnetic head Michael Andrew Parker 2003-11-25
6584676 Method for manufacturing a pole tip trimmed read/write head structure Yu-En Percy Chang, Michael Andrew Parker 2003-07-01
6542331 Magnetic head having write head with double split yoke Terence Lam, Edward Hinpong Lee, Samuel Wonder Yuan 2003-04-01
6521902 Process for minimizing electrostatic damage and pole tip recession of magnetoresistive magnetic recording head during pole tip trimming by focused ion beam milling Michael Andrew Parker 2003-02-18
6477008 Magnetic recording transducer with electronic shield Shanlin Duan, Terence Lam, Wai Cheung Leung 2002-11-05
6473276 Merged magnetic head which includes a write head with single-sided notched first pole piece Edward Hinpong Lee, Jyh-Shuey Lo 2002-10-29
6407891 Magnetic read/write head having electromagnetic field cancellation element Shanlin Duan, Terence Lam, Wai Cheung Leung 2002-06-18
6339872 Method of making a merged magnetic head that includes a write head with single-sided notched first pole piece Edward Hinpong Lee, Jyh-Shuey Lo 2002-01-22
6330128 Magnetic head assembly having open yoke write head with highly defined narrow track width Glen Adam Garfunkel, Edward Hin Pong Lee, Neil Leslie Robertson, Samuel Wonder Yuan 2001-12-11
6330122 Magnetic tester for disk surface scan Shanlin Duan, Terence Lam, Wai Cheung Leung 2001-12-11
6278591 Inverted merged MR head having plated notched first pole tip and self-aligned second pole tip Jyh-Shuey Lo 2001-08-21