Granted Patent
Utility
US 3,960,442 · App. 05/494,784
Ophthalmic lens series
Inventors:
John K. Davis, Henry Grant Fernald
Patented Case
View Patent ↗
Granted: Jun 1, 1976
Filed: Aug 5, 1974
Inventors
John K. Davis
Henry Grant Fernald
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.