Granted Patent
Utility
US 4,404,044 · App. 06/299,961
Method of quenching
Inventor:
Joseph F. Warchol
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Sep 8, 1981
Inventor
Joseph F. Warchol
Assignee (at issue)
E. F. Houghton & 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.