Granted Patent
Utility
US 4,655,565 · App. 06/701,134
Ophthalmic lenses with diffractive power
Inventor:
Michael H. Freeman
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Feb 13, 1985
Inventor
Michael H. Freeman
Assignee (at issue)
Pilkington PE Limited
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.