Granted Patent
Utility
US 4,213,331 · App. 05/971,577
Surface irregularity analyzer
Inventor:
John Porter
Patented Case
View Patent ↗
Granted: Jul 22, 1980
Filed: Dec 20, 1978
Inventor
John Porter
Assignee (at issue)
B. F. Goodrich 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.