An apparatus and method for verifying the material properties of a plug valve sealing element
CA 2355303 A1 · Owner: Smith, Gordon M. · Inventors: Smith, Gordon M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method to test a plug valve seal by embedding a test coupon into the face of the slip. Even the heat energy is averaged by placing the test coupon at the midsection of the slip. During the bond adhesive application all applicable surfaces have the same adhesive applied during the same time frame in the same environment (except under test coupon tab which shall be prevented from adhering mechanically or chemically). The elastomer prepared for the seal groove is identical and is prepared in the same batch as that for the test coupon and all installed with the same tackifying agent by the same individual. The seal cross-section is the same as the test section of the seal test …
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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 October 16, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2022.
- 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
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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.