Granted Patent
Utility
US 5,108,682 · App. 07/557,674
Coextrusion apparatus and method using an elastic die for varying the outer profile of a tubular extrudate
Inventors:
Dale A. Tompkins, Richard W. Sicka
Patented Case
View Patent ↗
Granted: Apr 28, 1992
Filed: Jul 24, 1990
Inventors
Dale A. Tompkins
Richard W. Sicka
Assignee (at issue)
Bridgestone Firestone
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.