Granted Patent
Utility
US 4,896,531 · App. 07/255,394
Sidewall appearance monitor
Inventor:
Richard H. Hayes
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Oct 11, 1988
Inventor
Richard H. Hayes
Assignee (at issue)
Eagle-Picher Industries, 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.