Granted Patent
Utility
US 4,163,440 · App. 05/796,019
Radiant heater
Inventor:
Hubert F. Stultz
Patented Case
View Patent ↗
Granted: Aug 7, 1979
Filed: May 11, 1977
Inventor
Hubert F. Stultz
Assignee (at issue)
Suburban Manufacturing, 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.