Granted Patent
Utility
US 5,206,476 · App. 07/767,184
Supplementary automobile duct heater
Inventors:
John B. Fresch, Thomas P. Warszawski
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Sep 30, 1991
Inventors
John B. Fresch
Thomas P. Warszawski
Assignee (at issue)
General Motors LLC
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.