Granted Patent
Utility
US 4,252,403 · App. 06/091,913
Coupler for a graded index fiber
Inventor:
Glenn C. Salisbury
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Nov 6, 1979
Inventor
Glenn C. Salisbury
Assignee (at issue)
International Telephone and Telegraph Corporation
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.