Granted Patent
Utility
US 4,509,140 · App. 06/391,778
Data transmitting link
Inventor:
Kin Cheung
Patented Case
View Patent ↗
Granted: Apr 2, 1985
Filed: Jun 24, 1982
Inventor
Kin Cheung
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.