Granted Patent
Utility
US 5,840,926 · App. 08/895,655
Photochromic articles
Inventor:
Frank J. Hughes
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Jul 17, 1997
Inventor
Frank J. Hughes
Assignee (at issue)
Vision-Ease Lens
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.