Granted Patent
Utility
US 4,290,669 · App. 06/107,299
Optical display apparatus
Inventors:
George M. Belva, Richard A. Mecklenborg
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Dec 26, 1979
Inventors
George M. Belva
Richard A. Mecklenborg
Assignee (at issue)
The Singer Company Limited
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.