Rotating blowout preventor with rigid washpipe
CA 1094949 A · Owner: Biffle, Morris S. · Inventors: Biffle, Morris S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotating blowout preventor of simplified construction which requires no kelly drive bushing and which has a, rotating external housing formed at the upper marginal end thereof within which the main bearings and seals are isolated. The external housing rotates about a fixed washpipe and supports a stripper seal doughnut to which a stripper seal is mounted in underlying relationship thereto. A removal clamp enables the doughnut and stripper rubber to be lifted free of the assembly for service or replacement. The bearing housing is fabricated in a manner to enable servicing the seals and bearings thereof without removing the blowout preventor from the top of a tool string. The bearing …
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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
- Granted February 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 3, 1998.
- 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.