Granted Patent
Utility
US 4,726,574 · App. 07/025,301
Vibration damper for helical coil spring
Inventors:
Werner Idigkeit, Benno Jorg, Heinz B. Seifert
Patented Case
View Patent ↗
Granted: Feb 23, 1988
Filed: Mar 13, 1987
Inventors
Werner Idigkeit
Benno Jorg
Heinz B. Seifert
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.