Piston or rod seal
CA 2031345 A1 · Owner: Carl Freudenberg · Inventors: Wetzel, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A piston or rod seal includes a first groove in a seal housing which groove is radially inwardly open towards a relatively movable machine part and receives a rubbing seal ring made of PTFE material and an elastic O-ring of rubber material. The O-ring is sealed against a groove base of the first groove and forces the rubbing seal ring against the relatively movable machine part. The rubbing seal ring has, on its side adjacent the relatively movable machine part at, least two sealing ridges which are separated by a second groove and on its side adjacent the O-ring, a conical. surface. The second groove has a rounded groove base with a radius which is substantially equal, a radial depth of …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 3, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.