Granted Patent
Utility
US 4,354,817 · App. 06/290,380
Composite extrusion die
Inventor:
Robert W. Gilman
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Aug 5, 1981
Inventor
Robert W. Gilman
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.