Granted Patent
Utility
US 4,457,686 · App. 06/477,260
Pellet extrusion die
Inventor:
Thomas J. Rowland
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Mar 21, 1983
Inventor
Thomas J. Rowland
Assignee (at issue)
Ingersoll-Rand 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.