Granted Patent
Utility
US 4,336,924 · App. 06/113,691
Apparatus for quenching heated workpieces
Inventor:
Paul L. Day
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Jan 21, 1980
Inventor
Paul L. Day
Assignee (at issue)
Park-Ohio Industries
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.