Granted Patent
Utility
US 4,940,182 · App. 07/427,384
Rotary swivel for cab heating system
Inventor:
Dennis Heyne
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Oct 27, 1989
Inventor
Dennis Heyne
Assignee (at issue)
J. I. Case 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.