Shaft-wall seal with elastomerically protected reinforcement rings
CA 2083565 C · Owner: Freiwald, Gerhard · Inventors: Klein, Norbert; Freiwald, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Seal arrangement for the sealing of a shaft extending through a bore in a wall includes a radially sealing seal ring which has at least one sealing lip of elastomeric material for sealingly engaging the shaft along its circumference, an L-shaped first stiffening ring having a radially outwardly directed first leg and an axially extending second leg and an anti-friction bearing positioned in radial direction between the shaft and the second leg. The sealing lip is fixed to the first leg of the first stiffening ring. The second leg is enclosed by elastomeric material at least at its axial end and sealingly engages the bore wall under radial pretension. The inner ring of the anti-friction …
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 January 20, 1993 and granted June 30, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2015.
- 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.