Granted Patent
Utility
US 4,528,044 · App. 06/660,092
Aqueous quenchants containing polyoxazolines and n-vinyl heterocyclic polymers and their use in quenching steel
Inventor:
Joseph F. Warchol
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Oct 12, 1984
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.