Granted Patent
Utility
US 4,838,675 · App. 07/063,971
Method for improving progressive lens designs and resulting article
Inventors:
Eric F. Barkan, David H. Sklar
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Jun 19, 1987
Inventors
Eric F. Barkan
David H. Sklar
Assignee (at issue)
Sola International Holdings 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.