Granted Patent
Utility
US 4,763,977 · App. 06/690,099
Optical fiber coupler with tunable coupling ratio and method of making
Inventors:
Brian S. Kawasaki, Masao Kawachi, Kenneth O. Hill, Derwyn C. Johnson
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Jan 9, 1985
Inventors
Brian S. Kawasaki
Masao Kawachi
Kenneth O. Hill
Derwyn C. Johnson
Assignee (at issue)
Canadian Patents and Development Limited
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.