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USPTO Patent Rankings Data through Dec 31, 2025
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Charles Chang — 57 Patents

UNUnknown: 25 patents #139 of 83,584Top 1%
ITITRI: 12 patents #377 of 9,619Top 4%
WIWistron: 1 patents #959 of 2,107Top 50%
WCW.R. Grace & Co.-Conn.: 1 patents #543 of 1,045Top 55%
The Boeing: 1 patents #8,630 of 15,756Top 55%
Columbia, MD: #6 of 1,501 inventorsTop 1%
Maryland: #183 of 35,612 inventorsTop 1%
Overall (All Time): #42,642 of 4,157,543Top 2%
57 Patents All Time
Charles Chang has been granted 57 US patents while listed as an inventor at Unknown. The first was granted in 1990 and the most recent in October 2020. Charles Chang ranks #42,642 of 4,157,543 US inventors in our database (top 1.0%). Patent records list Charles Chang in Columbia, MD, US.

Issued Patents All Time

Showing 1–25 of 57 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
10819130 Mobile charge/discharge device Ronald Chang, Heng-Chang Su 2020-10-27
8604877 Differential amplifier Ronald Chang 2013-12-10
8464730 Cosmetic compact Serena Eng 2013-06-18
8292112 Aluminum container — 2012-10-23
8113219 Cosmetic powder dispenser with retractable brush — 2012-02-14
8109406 Beverage container construction — 2012-02-07
7997286 Cosmetic compact Serena Eng 2011-08-16
7785026 Cosmetic applicator device Serena Eng 2010-08-31
7503331 Cosmetic compact Serena Eng 2009-03-17
7023520 Method and system for fabricating liquid crystal film and method for fabricating brightening film Chun-Fa Chen, Kun-Mao Yu 2006-04-04
6811240 Manufacturing method for an ID circuit of inkjet chips Jhih-Ping Lu 2004-11-02
D490936 Lipstick compact case — 2004-06-01
6666545 Driver transistor structure of inkjet print head chip and the method for making the same Chien-Hung Liu, Jian-Chiun Liou, Je-Ping Hu, Chun-Jung Chen 2003-12-23
6644795 Pressure control device for an inkjet pen Sune-Chan Lin, Shyh-Haur Su, Chun-Jung Chen, Bor-Shiun Lee, Chi-Bin Lo 2003-11-11
6568090 Cosmetic pencil sharpener Robert J. Sheffler 2003-05-27
D474861 Cosmetic container Jack Rodriguez 2003-05-20
6543887 Inkjet print head Jhih-Ping Lu, Shyh-Haur Su, Yuan-Liang Lan 2003-04-08
6526989 Cosmetic pot with hidden hinge between cover and base Robert J. Sheffler 2003-03-04
6478397 Method of arranging orifices on a print head and the corresponding structure Hui-Huang Chang, Yu-Chu Huang 2002-11-12
6474345 Cosmetic container with cap Jack Rodriquez 2002-11-05
6457808 Multi-color level inkjet head chip structure Ching-Long Chiu, Shyh-Haur Su 2002-10-01
6450359 Sanitary beverage can lid Lucy Chang 2002-09-17
6412918 Back-shooting inkjet print head Chia-Tai Chen, Shyh-Haur Su, Ching-Yi Mao, Je-Ping Hu, Chun-Jung Chen 2002-07-02
6409324 Method and apparatus for supplying ink to an printhead Cheng-Wei Hsu, Shyh-Haur Su, Chieh-Wen Wang, I-Chung Hou 2002-06-25
6405737 Lipstick package with dispensing compartment(s) Robert J. Sheffler 2002-06-18

Nearby-Ranked Inventors

Keith Harry Nothacker57
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Rafi Ahmed57
Craig Robertson57
Toshiyuki Nomura57
Woong-il Choi57