Granted Patent
Utility
US 4,290,421 · App. 06/161,725
Fiberscope
Inventor:
Walter P. Siegmund
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Jun 23, 1980
Inventor
Walter P. Siegmund
Assignee (at issue)
American Optical 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.