Granted Patent
Utility
US 5,798,817 · App. 08/563,454
Bifocal contact lenses
Inventor:
John Trevor de Carle
Patented Case
View Patent ↗
Granted: Aug 25, 1998
Filed: Nov 28, 1995
Inventor
John Trevor de Carle
Assignee (at issue)
Aspect Vision Care Ltd.
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.