Granted Patent
Utility
US 4,185,902 · App. 05/912,261
Light absorption device for the prevention of stray light in particular in a phototypesetter
Inventor:
Michael Plaot
Patented Case
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Granted: Jan 29, 1980
Filed: Jun 2, 1978
Inventor
Michael Plaot
Assignee (at issue)
Michael Plaot
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.