Granted Patent
Utility
US 4,591,231 · App. 06/738,550
Variable optical attenuator
Inventors:
Manfred Kaiser, Wolfgang Stiepek
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: May 28, 1985
Inventors
Manfred Kaiser
Wolfgang Stiepek
Assignee (at issue)
International Standard Electric 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.