Granted Patent
Utility
US 6,431,457 · App. 09/660,800
Air heater control
Inventor:
James V. Dirkes
Patented Case
View Patent ↗
Granted: Aug 13, 2002
Filed: Sep 13, 2000
Inventor
James V. Dirkes
Assignee (at issue)
Rapid Engineering, 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.