Improved blow-out preventer
CA 2291358 A1 · Owner: Lee, Daniel · Inventors: Lee, Daniel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a versatile blow-out preventer having a pair of mechanically operated rams mounted in a single body occupying a minimum , vertical, space, and being adapted to operate either to shut off the flow or to restrict the flow, to a flow tee and prevent flow to the top of the well head or stuffing box. One, embodiment of the invention additionally provides a bladder which may operate whether or not there is equipment such as pump rods or cables in the well head.
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 December 2, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 2, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 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.