Granted Patent
Utility
US 4,428,587 · App. 06/493,391
Seal ring with channel for radially accelerating medium to be sealed
Inventor:
Hans Forch
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: May 10, 1983
Inventor
Hans Forch
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.