Granted Patent
Utility
US 6,113,812 · App. 08/905,495
Photochromic articles
Inventor:
Frank J. Hughes
Patented Case
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Granted: Sep 5, 2000
Filed: Aug 4, 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.