Granted Patent
Utility
US 4,989,938 · App. 07/476,743
Continuously variable fiber optic attenuator
Inventor:
Thomas W. Tamulevich
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Feb 7, 1990
Inventor
Thomas W. Tamulevich
Assignee (at issue)
Light Control Systems, 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.