Granted Patent
Utility
US 4,274,821 · App. 06/125,667
Die for extruding reinforced fabric
Inventor:
Ralph F. Kiemer
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Feb 28, 1980
Inventor
Ralph F. Kiemer
Assignee (at issue)
The Steelastic Company, LLC
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.