Granted Patent
Utility
US 4,234,891 · App. 06/062,446
Optical illumination and distortion compensator
Inventors:
James C. Beck, Harrie W. Nielsen
Patented Case
View Patent ↗
Granted: Nov 18, 1980
Filed: Jul 30, 1979
Inventors
James C. Beck
Harrie W. Nielsen
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.