Granted Patent
Utility
US 4,806,792 · App. 07/069,407
Differential amplifier circuit
Inventor:
Elmer C. Simmons
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Jul 1, 1987
Inventor
Elmer C. Simmons
Assignee (at issue)
Digital Equipment Corporation
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.