Granted Patent
Utility
US 4,529,427 · App. 06/001,155
Method for making low-loss optical waveguides on an industrial scale
Inventor:
William George French
Patented Case
View Patent ↗
Granted: Jul 16, 1985
Filed: Jan 5, 1979
Inventor
William George French
Assignee (at issue)
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.