Granted Patent
Utility
US 4,433,970 · App. 06/488,313
Method of heating a lightguide preform
Inventor:
Carroll D. Spainhour
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Apr 25, 1983
Inventor
Carroll D. Spainhour
Assignee (at issue)
Western Electric Company, Inc.
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.