Granted Patent
Utility
US 5,049,331 · App. 07/443,214
Method of manufacturing a thread-reinforced, extruded rubber body
Inventor:
Jurgen Hempel
Patented Case
View Patent ↗
Granted: Sep 17, 1991
Filed: Nov 28, 1989
Inventor
Jurgen Hempel
Assignee (at issue)
Firma Carl Freudenberg
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.