Granted Patent
Utility
US 4,309,168 · App. 06/167,816
System for combining multiple fuels to produce controllable gas temperatures in asphalt drum mixers
Inventors:
Fredric W. Prill, Lee V. Binz
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Jul 14, 1980
Inventors
Fredric W. Prill
Lee V. Binz
Assignee (at issue)
Barber-Greene Company
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.