Granted Patent
Utility
US 4,900,139 · App. 07/266,234
Color corrected projection lens
Inventor:
Melvyn H. Kreitzer
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Oct 28, 1988
Inventor
Melvyn H. Kreitzer
Assignee (at issue)
U.S. Precision Lens Incorporated
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.