Granted Patent
Utility
US 4,272,306 · App. 06/088,722
Carburizing tub apparatus and method
Inventor:
George E. Reisinger, Jr.
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Sep 27, 1979
Inventor
George E. Reisinger, Jr.
Assignee (at issue)
Caterpillar Tractor Co.
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.