Granted Patent
Utility
US 6,269,721 · App. 09/201,317
Electric paper punch
Inventor:
Tzu-Feng Tseng
Patented Case
View Patent ↗
Granted: Aug 7, 2001
Filed: Nov 27, 1998
Inventor
Tzu-Feng Tseng
Assignee (at issue)
Primax Electronics Ltd.
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.