Granted Patent
Utility
US 4,593,497 · App. 06/587,549
Abrasive seal recovery system
Inventors:
David L. O'Dell, Philip H. Diehn
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Mar 8, 1984
Inventors
David L. O'Dell
Philip H. Diehn
Assignee (at issue)
Wheelabrator-Frye 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.