Granted Patent
Utility
US 6,242,712 · App. 09/309,680
Air heater with perforated resistance element
Inventor:
Andrew Prust
Patented Case
View Patent ↗
Granted: Jun 5, 2001
Filed: May 11, 1999
Inventor
Andrew Prust
Assignee (at issue)
Phillips & Temro Industries 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.