Granted Patent
Utility
US 5,944,508 · App. 08/834,727
Portable heated appliance with catalytic heater with improved ignition system
Inventor:
James Bonnema
Patented Case
View Patent ↗
Granted: Aug 31, 1999
Filed: Apr 1, 1997
Inventor
James Bonnema
Assignee (at issue)
The Schawbel Corporation
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.