Seal arrangement
CA 2102472 C · Owner: Carl Freudenberg · Inventors: Freiwald, Gerhard; Klein, Norbert
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 rotatable shaft extending through a bore in a housing wall includes a seal ring which has at least one sealing lip of, elastomeric material for sealingly engaging the shaft along its outer circumference, first and second stiffening rings an elastic intermediate coating and an antifriction, bearing. The first stiffening ring is L-shaped in cross-section with a radially, outwardly directed first leg and an axially extending second leg. The antifriction, bearing is fitted in radial direction between the shaft and the second leg. The, sealing lip is fixed to the first leg. The second leg at least partly overlaps and, tightly engages an outer ring 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 November 4, 1993 and granted January 9, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 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.