Granted Patent
Utility
US 4,169,679 · App. 05/859,923
Apparatus for the extrusion of cellular thermoplastic material
Inventors:
John C. Miller, Archibald L. Burnett, Leonard S. Scarola
Patented Case
View Patent ↗
Granted: Oct 2, 1979
Filed: Dec 12, 1977
Inventors
John C. Miller
Archibald L. Burnett
Leonard S. Scarola
Assignee (at issue)
Union Carbide Corporation
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.