Granted Patent
Utility
US 4,378,686 · App. 05/883,662
Forming of materials by extrusion
Inventor:
John A. Pardoe
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Mar 6, 1978
Inventor
John A. Pardoe
Assignee (at issue)
United Kingdom Atomic Energy Authority
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.