Granted Patent
Utility
US 5,770,115 · App. 08/639,855
Photochromic naphthopyran compositions of improved fatigue resistance
Inventor:
Michael S. Misura
Patented Case
View Patent ↗
Granted: Jun 23, 1998
Filed: Apr 19, 1996
Inventor
Michael S. Misura
Assignee (at issue)
PPG Industries, 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.