Granted Patent
Utility
US 5,189,720 · App. 07/503,027
Method for manufacturing steel wire material for reinforcing optical fiber
Inventors:
Teruyuki Murai, Susumu Yamamoto
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Apr 2, 1990
Inventors
Teruyuki Murai
Susumu Yamamoto
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
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.