Granted Patent
Utility
US 5,099,366 · App. 07/399,666
Low frequency restorer
Inventor:
Steven Ahlgrim
Patented Case
View Patent ↗
Granted: Mar 24, 1992
Filed: Aug 25, 1989
Inventor
Steven Ahlgrim
Assignee (at issue)
Ampex 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.