Improved seal
CA 2537153 C · Owner: Martin, David · Inventors: Sinclair, Ewan; Martin, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An annular sealing element (12) to seal between metal surfaces for use in flanges, joints, packers and the like, located in oil and gas exploration and production equipment. The sealing element has inner and outer metal deformable surfaces (20, 22) joined at ends (24, 26) defining an interior volume (30) , which is entirely filled with a plastic deformable material (28). The surfaces are arranged such that on compression of the element (12) from the ends (24 26), the element will deform in a controlled manner on a cantilever principle. The volume of filler (28) and the interior volume (30) remain substantially equal during compression so that delamination does not occur. Thus 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 August 26, 2004 and granted February 26, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 26, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2026.
- 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.