Valve apparatus
CA 2083276 C · Owner: Alfa-Laval Agriculture International Ab · Inventors: Olofsson, Hans Kristoffer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A valve apparatus (1) comprises at least one valve device having a chamber (4), an inlet (5) to and an outlet (6) from the chamber. A movable member (7) in the chamber is arranged to displace a membrane (9), such that this is rolled against the wall of the chamber between a closing position at which the membrane covers the , opening of the outlet (6) in the chamber and an opening position, at which the opening of the outlet is uncovered. A flow passage is formed for a fluid to flow from the inlet to the outlet when the opening of the outlet is uncovered. The movable member (7) is provided with an entrainment member (10) arranged to extend into and be displaced in said flow passage …
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 May 21, 1991 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2013.
- 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.