Modulating positive shut-off mechanism
CA 2009288 C · Owner: Ewing, James H. · Inventors: Ewing, James H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for modulating and stopping process fluid flow includes a process fluid path a valve mechanism, and a positive shut-off mechanism. The process fluid path has an inlet and an outlet. The valve mechanism is positioned between the inlet and outlet and is configured, to modulate flow therebetween. The positive shut-off mechanism is contiguous to the valve mechanism and is, configured to selectively provide a force to the valve mechanism, the force being sufficiently large to cause the valve mechanism to completely stop flow through the process fluid path.
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 February 5, 1990 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2012.
- 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.