Granted Patent
Utility
US 4,495,252 · App. 06/112,525
Wear-resistant metallic article
Inventors:
James W. O'Brien, Frank Spevak
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Jan 16, 1980
Inventors
James W. O'Brien
Frank Spevak
Assignee (at issue)
Imperial Clevite 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.