Granted Patent
Utility
US 4,255,481 · App. 06/079,000
Mask for selectively transmitting therethrough a desired light radiant energy
Inventors:
Donald Dinella, Ching-Ping Wong
Patented Case
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Granted: Mar 10, 1981
Filed: Sep 26, 1979
Inventors
Donald Dinella
Ching-Ping Wong
Assignee (at issue)
Western Electric Company, 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.