Granted Patent
Utility
US 4,521,501 · App. 06/513,399
Method for reducing degradation of an optical image in an exposure lighthouse
Inventor:
Frank T. D'Augustine
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Jul 14, 1983
Inventor
Frank T. D'Augustine
Assignee (at issue)
RCA 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.