Granted Patent
Utility
US 4,853,777 · App. 07/150,136
Method for evaluating smooth surfaces
Inventor:
Stephen S. Hupp
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Jan 29, 1988
Inventor
Stephen S. Hupp
Assignee (at issue)
Ashland Oil, Inc.
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.