Granted Patent
Utility
US 4,291,940 · App. 05/805,865
Low loss access coupler for multimode optical fiber distribution systems
Inventors:
Brian S. Kawasaki, Kenneth O. Hill, Derwyn C. Johnson
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Jun 13, 1977
Inventors
Brian S. Kawasaki
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.