Granted Patent
Utility
US 4,907,787 · App. 07/259,886
Rubber cartridge spring
Inventor:
Hans-Werner Schwerdt
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Oct 19, 1988
Inventor
Hans-Werner Schwerdt
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.