Pressure equalized flow control valve
CA 2128945 C · Owner: National-Oilwell · Inventors: Baker, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flow control valve such as a ball valve (12) for controlling fluid flow through a, flow line (16). The control valve includes a flow chamber (18) an upstream, passage (19), a downstream passage (20) an annular valve body (24), a, retainer (26) sealingly engaging the outer annular surface of the flow line and, secured to the valve body by a pair of flanges (28) a flow control ball (32), rotatably disposed within the flow chamber for controlling fluid flow through the, passages, an operating member (42) for rotating the ball between open and closed positions and means (70) for equalizing the pressure in the valve chamber. The ball includes a centrally bored flow passageway (36) for …
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 July 27, 1994 and granted December 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 2016.
- 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.