Granted Patent
Utility
US 5,615,973 · App. 08/314,348
Paving machine with gravity feed hopper and auger mechanism
Inventor:
Thomas R. Campbell
Patented Case
View Patent ↗
Granted: Apr 1, 1997
Filed: Sep 29, 1994
Inventor
Thomas R. Campbell
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.