Granted Patent
Utility
US 4,523,848 · App. 06/423,309
Polariscope
Inventors:
Barry Gorman, Edwin J. Hearn
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: Sep 24, 1982
Inventors
Barry Gorman
Edwin J. Hearn
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.