Granted Patent
Utility
US 4,925,890 · App. 07/356,204
Process for processing thermoplastic polymers
Inventors:
Pak S. Leung, Errol D. Goddard, Fred H. Ancker
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: May 24, 1989
Inventors
Pak S. Leung
Errol D. Goddard
Fred H. Ancker
Assignee (at issue)
Union Carbide Chemicals & Plastics
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.