Yun-Ching Ma has been granted 12 US patents while listed as an inventor at Polytronics Technology . The first was granted in 2002 and the most recent in April 2007. Yun-Ching Ma ranks #396,045 of 4,157,543 US inventors in our database (top 9.5%). Patent records list Yun-Ching Ma in Taipei, TW.
Patents per Year Patents granted per year, 2002 to 2007 Bar chart with a peak of 3 patents in 2002. peak 3 2002: 3 patents 2002 2003: 2 patents 2003 2004: 3 patents 2004 2005: 2 patents 2005 2006: 1 patents 2006 2007: 1 patents 2007
Issued Patents All Time
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Showing 1–12 of 12 patents
Patent # Title Co-Inventors Date
7203049 Over-current protection device Edward Chu , David Shau Chew Wang 2007-04-10
7071810 Over-current protection apparatus Ching Han Yu 2006-07-04
6898063 Over-current protection device Edward Chu , David Shau Chew Wang 2005-05-24
6853527 Over-current protection apparatus for high voltage Edward Chu , David Shau Chew Wang 2005-02-08
6809626 Over-current protection device Edward Chu , David Shau Chew Wang 2004-10-26
6806519 Surface mountable device Edward Chu , David Shau Chew Wang 2004-10-19
6794980 Over-current protection apparatus and method for making the same Edward Chu , David Shau Chew Wang 2004-09-21
6665164 Surface mountable over-current protecting apparatus Edward Chu , David Shau Chew Wang 2003-12-16
6512446 Over-current protection apparatus David Shau Chew Wang , Chiung-Huei Shieh 2003-01-28
6487084 Printed circuit board comprising an embedded functional element therein Edward Chu , David Shau Chew Wang 2002-11-26
6479575 Electrical devices comprising conductive polymer blend compositions Fu Hua Chu 2002-11-12
6377467 Surface mountable over-current protecting device Fu Hua Chu , David Shau Chew Wang 2002-04-23