Granted Patent
Utility
US 5,538,340 · App. 08/166,030
Counterflow drum mixer for making asphaltic concrete and methods of operation
Inventor:
David F. Brashears
Patented Case
View Patent ↗
Granted: Jul 23, 1996
Filed: Dec 14, 1993
Inventor
David F. Brashears
Assignee (at issue)
GENCOR INDUSTRIES, 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.