Granted Patent
Utility
US 6,727,439 · App. 10/055,925
Pressure sensitive pen
Inventors:
Ching-Chuan Chao, Bor-Sen Chang, Chung-Wen Hsu
Patented Case
View Patent ↗
Granted: Apr 27, 2004
Filed: Jan 28, 2002
Inventors
Ching-Chuan Chao
Bor-Sen Chang
Chung-Wen Hsu
Assignee (at issue)
Aiptek International GmbH
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.