Butterfly valve
CA 1236071 A · Owner: Dresser, Inc. · Inventors: Verdelet, Alain B.A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A butterfly valve comprising a body 1, a passage 2 extending through the body, a closure or butterfly member 3 mounted in the passage 2 to pivot about an axis orthogonal to the axis of the passage so as to be movable between a closing position in which a sealing element fixed or formed on the periphery of the disc of he closure member has a sealing contact with a seat 8 carried by the body and a fully open position roughly perpendicular to the closing position the peripheral, surface of the closure member 3 and the conjucate surface of the seat 8 being conical surfaces defined by two cones of revolution while the, axis of rotation of the closing member is offset along the axis of the …
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 May 3, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2005.
- 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.