IP Library › Granted Patent US 5,877,839
Granted Patent Utility
US 5,877,839 · App. 08/811,985

Multifocal ophthalmic lens

Inventor: Valdemar Portney
Patented Case View Patent ↗
Granted: Mar 2, 1999 Filed: Mar 5, 1997
Inventor
Valdemar Portney

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 5,877,839
App. No.
08/811,985
Filed
1997-03-05
Granted
1999-03-02
Kind
A