IP Library › Granted Patent US 4,886,281
Granted Patent Utility
US 4,886,281 · App. 07/172,998

Sealing ring having a sealing surfacer with a recessional annular projection

Inventors: Peter Ehrmann, Karl-Heinz Spies, Rolf Vogt
Patented Case View Patent ↗
Granted: Dec 12, 1989 Filed: Mar 23, 1988
Inventors
Peter Ehrmann
Karl-Heinz Spies
Rolf Vogt
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,886,281
App. No.
07/172,998
Filed
1988-03-23
Granted
1989-12-12
Kind
A