Granted Patent
Utility
US 4,939,396 · App. 07/303,693
Detector circuit
Inventor:
Ulrich Schoettmer
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Jan 27, 1989
Inventor
Ulrich Schoettmer
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.