Method and cartridge seal for packing a valve
CA 2178695 C · Owner: Cornette Technology L.L.C. · Inventors: Cornette, Kevin Riely
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A packing system, for providing a seal around a valve stem, including a packing cartridge and a bushing. The packing cartridge includes a sleeve which has a tapered central passage. The sleeve also has external male threads and a hex head. Packing material is attached to the tapered central passage of the sleeve using an adhesive. The sleeve together with the packing material form the packing cartridge. The bushing also has a tapered central passage. The packing of the present invention is applied by sliding the bushing around the valve stem, and then sliding the packing cartridge around the valve stem. Once the bushing is seated in the stuffing-box of the valve, the sleeve is tightened …
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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 June 10, 1996 and granted July 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2018.
- 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.