Granted Patent
Utility
US 5,031,885 · App. 07/433,327
Rubber sleeve spring
Inventor:
Hans-Werner Schwerdt
Patented Case
View Patent ↗
Granted: Jul 16, 1991
Filed: Nov 8, 1989
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.