Sealing ring for use in a pipe coupling
CA 2040320 C · Owner: Leeuwenburg, Ewout · Inventors: Van Kooij, Robert Justus; Leeuwenburg, Ewout
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sealing ring of an elastic material, for use in a pipe coupling in which the ring is placed in a radially inward open peripheral groove and is retained in said groove by means of a supporting ring(6) which sealing ring in each radial cross-section is the shape of an inwardly open essentially rectangular trough with a circular bottom (2) a projecting, lip (8) being provided which runs inwards at an angle from the end of the first circumferential wall of the trough the free end of which lip lies, at a radial distance from the axis of symmetry of the ring which is smaller than the external radius of the push-in end part of a pipe to be coupled and at the end of the second side wall of the …
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 April 12, 1991 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2013.
- 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.