Granted Patent
Utility
US 4,881,520 · App. 07/120,038
Propane-fueled cooking apparatus
Inventor:
Dennis V. Hefling
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Nov 13, 1987
Inventor
Dennis V. Hefling
Assignee (at issue)
The Coleman Company, Inc.
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.