Granted Patent
Utility
US 5,136,669 · App. 07/670,549
Variable ratio fiber optic coupler optical signal processing element
Inventor:
David W. Gerdt
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Mar 15, 1991
Inventor
David W. Gerdt
Assignee (at issue)
Sperry Marine 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.