Granted Patent
Utility
US 6,661,541 · App. 09/543,006
Closed circuit control device for scanner
Inventor:
Tsanghuai Chang
Patented Case
View Patent ↗
Granted: Dec 9, 2003
Filed: Apr 4, 2000
Inventor
Tsanghuai Chang
Assignee (at issue)
Umax Data Systems, Inc.
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.