Granted Patent
Utility
US 4,931,228 · App. 07/333,982
Method of manufacturing soft contact lens buttons
Inventor:
Edward Michael Keeley
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Apr 5, 1989
Inventor
Edward Michael Keeley
Assignee (at issue)
Coastvision
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.