Granted Patent
Utility
US 4,581,184 · App. 06/570,736
Oxygen permeable lens
Inventor:
James Powell
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Jan 16, 1984
Inventor
James Powell
Assignee (at issue)
Precision-Cosmet Co., Inc.
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.