Wellhead production blowout preventer ram
CA 2260655 A1 · Owner: Farquharson, Keith D. · Inventors: Lam, Tony M.; Farquharson, Keith D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The ram comprises an L-shaped bottom retainer plate an L-shaped, seal element and a top retainer plate having an L-shaped inner surface. The front portions of the inner surfaces of the retainer plates are parallel and acutely angled relative to the longitudinal axis of the ram bore. Thus the top retainer plate is tapered rearwardly. The seal element protrudes forwardly of the retainer plate which, in turn, protrudes forwardly of the bottom retainer plate. When the rams close, the top retainer plates are driven rearwardly and act as wedges to compress the seal elements both downwardly and rearwardly. The L-shaped design also leads to minimization of canting of the plates. A groove is …
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 February 2, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 2, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2021.
- 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.