Granted Patent
Utility
US 5,077,539 · App. 07/633,762
Switching amplifier
Inventor:
John R. Howatt
Patented Case
View Patent ↗
Granted: Dec 31, 1991
Filed: Dec 26, 1990
Inventor
John R. Howatt
Assignee (at issue)
APOGEE TECHNOLOGY CONSULTANTS, LLC
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.