Granted Patent
Utility
US 4,403,490 · App. 06/276,937
Metal forming lubricant and method of use thereof
Inventor:
Donald J. Sargent
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Jun 24, 1981
Inventor
Donald J. Sargent
Assignee (at issue)
E/M Lubricants, 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.