Granted Patent
Utility
US 4,597,629 · App. 06/158,419
Solar blind ultraviolet filter
Inventors:
Robert J. Kraushaar, Kevin B. Ward
Patented Case
View Patent ↗
Granted: Jul 1, 1986
Filed: Jun 4, 1980
Inventors
Robert J. Kraushaar
Kevin B. Ward
Assignee (at issue)
International Telephone and Telegraph 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.