Wellhead seal assembly
CA 1289064 C · Owner: Cameron Iron Works Usa, Inc. · Inventors: Cassity, Thomas G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The improved wellhead seal assembly includes an annular metal seal ring having upper spaced apart inner and outer rims with an upper energizing ring positioned between such rims and movable axially between them a, resilient seal embedded in and extending through ports in the central portion of the seal ring, lower inner and outer seal rings connected to said central portion of said seal ring by inner and outer bellows and a wedging ring depending from the central portion of the seal ring between such bellows and adapted to move downward between the inner and outer seal rings to wedge them apart into sealing engagement with the inner and outer sealing surfaces, such movement being responsive …
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 September 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2008.
- 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.