Granted Patent
Utility
US 4,330,170 · App. 06/097,313
Low-loss star couplers for optical fiber systems
Inventors:
Derwyn C. Johnson, Brian S. Kawasaki, Kenneth O. Hill
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Nov 26, 1979
Inventors
Derwyn C. Johnson
Brian S. Kawasaki
Kenneth O. Hill
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.