Granted Patent
Utility
US 4,391,621 · App. 06/246,551
Method of making lenses having a spherical face
Inventor:
Walter P. Siegmund
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: Mar 23, 1981
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.