Granted Patent
Utility
US 5,004,331 · App. 07/347,111
Catadioptric projector, catadioptric projection system and process
Inventors:
Eric C. Haseltine, Helene H. Jones
Patented Case
View Patent ↗
Granted: Apr 2, 1991
Filed: May 3, 1989
Inventors
Eric C. Haseltine
Helene H. Jones
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.