Granted Patent
Utility
US 4,334,780 · App. 06/053,331
Optical surface roughness detection method and apparatus
Inventor:
Benjamin J. Pernick
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Jun 29, 1979
Inventor
Benjamin J. Pernick
Assignee (at issue)
Grumman Aerospace 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.