Granted Patent
Utility
US 4,808,813 · App. 06/859,563
Self contained surface contamination sensor for detecting external particulates and surface discontinuities
Inventor:
Robert J. Champetier
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: May 5, 1986
Inventor
Robert J. Champetier
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.