Granted Patent
Utility
US 5,100,232 · App. 07/609,366
Apparatus and method for detecting hidden marks on progressive aspheric ophthalmic lenses
Inventors:
Luther Smith, John T. Winthrop
Patented Case
View Patent ↗
Granted: Mar 31, 1992
Filed: Nov 5, 1990
Inventors
Luther Smith
John T. Winthrop
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.