Granted Patent
Utility
US 5,531,212 · App. 08/227,345
Multi oil furnace
Inventors:
Benjamin K. Smoker, David J. Yoder, Benuel F. Smoker, Frederick W. Phillips, Emanuel S. Beiler
Patented Case
View Patent ↗
Granted: Jul 2, 1996
Filed: Apr 14, 1994
Inventors
Benjamin K. Smoker
David J. Yoder
Benuel F. Smoker
Frederick W. Phillips
Emanuel S. Beiler
Assignee (at issue)
Clean Burn, 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.