Granted Patent
Utility
US 4,638,747 · App. 06/718,070
Coal-fired asphalt plant
Inventors:
J. Donald Brock, James G. May
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Apr 1, 1985
Inventors
J. Donald Brock
James G. May
Assignee (at issue)
Astec 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.