Granted Patent
Utility
US 4,367,170 · App. 05/543,711
Stabilized photochromic materials
Inventors:
Donald R. Uhlmann, Elias Snitzer, Richard J. Hovey, Nori Y. C. Chu
Patented Case
View Patent ↗
Granted: Jan 4, 1983
Filed: Jan 24, 1975
Inventors
Donald R. Uhlmann
Elias Snitzer
Richard J. Hovey
Nori Y. C. Chu
Assignee (at issue)
American Optical Corporation
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.