Granted Patent
Utility
US 4,578,024 · App. 06/704,243
Coextrusion apparatus
Inventors:
Richard W. Sicka, Dale A. Tompkins
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Feb 22, 1985
Inventors
Richard W. Sicka
Dale A. Tompkins
Assignee (at issue)
The Firestone Tire & Rubber 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.