Granted Patent
Utility
US 4,848,881 · App. 07/011,393
Variable lens and birefringence compensator
Inventors:
Osher Kahan, Eduard Gregor
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Feb 4, 1987
Inventors
Osher Kahan
Eduard Gregor
Assignee (at issue)
Hughes Aircraft Company
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.