Granted Patent
Utility
US 4,521,909 · App. 06/538,858
Dual level pattern recognition system
Inventor:
Patrick Wang
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Oct 4, 1983
Inventor
Patrick Wang
Assignee (at issue)
Wang Laboratories, 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.