Granted Patent
Utility
US 4,715,720 · App. 06/882,294
Drum mix asphalt plant with knock-out box and separate pugmill coater
Inventor:
J. Donald Brock
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: Aug 18, 1986
Inventor
J. Donald Brock
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.