Granted Patent
Utility
US 5,702,440 · App. 08/592,752
Multifocal ophthalmic lens for dim-lighting conditions
Inventor:
Valdemar Portney
Patented Case
View Patent ↗
Granted: Dec 30, 1997
Filed: Jan 26, 1996
Inventor
Valdemar Portney
Assignee (at issue)
Allergan, 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.