Mechanical drive packer
CA 1256019 A · Owner: Hydril Company · Inventors: Colvin, Kenneth W.; Burton, James A.; Keithahn, Julian D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An annular blowout preventer packer unit is disclosed having an annulus of elastomeric material in which is embedded metallic drive inserts provided in an outward circle about the axis. Metallic lead inserts are provided in an inward circle about the axis. The top and bottom plates of the drive inserts have two angled longitudinal forward surfaces which interface with reverse angled adjacent longitudinal rearward surfaces of the top and bottom plates of the lead inserts, respectively. When the BOP piston is closed the drive inserts cause, the lead inserts to advance inwardly a greater radial distance than the advance of the drive inserts. The result is that less stroke may be required to …
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
- Granted June 20, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 20, 2006.
- 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.