Granted Patent
Utility
US 4,845,446 · App. 06/945,216
Dynamically variable attenuator
Inventor:
Stephen Roth
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Dec 19, 1986
Inventor
Stephen Roth
Assignee (at issue)
II Morrow 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.