Granted Patent
Utility
US 4,852,968 · App. 07/033,327
Optical fiber comprising a refractive index trench
Inventor:
William Alfred Reed
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Apr 2, 1987
Inventor
William Alfred Reed
Assignee (at issue)
American Telephone and Telegraph Company, AT&T Bell Laboratories
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.