Granted Patent
Utility
US 6,681,760 · App. 10/183,713
Direct-fired heater
Inventor:
Daniel Topp
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: Jun 25, 2002
Inventor
Daniel Topp
Assignee (at issue)
Topp Construction Services, 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.