Non-leaking switching double valve
CA 2132238 C · Owner: Schramm, Norbert · Inventors: Brackelmann, Wolfgang; Baumbach, Frank; Schramm, Norbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A leak resistant, switching, double valve system consists of two sliding valve bodies in a valve housing with connecting lines. The two sliding valve bodies, which can be actuated independently of one another, are in contact in the closed position with valve seats in the valve housing and are located, at some distance one behind the other forming a leak cavity, between them. During the opening process the first sliding, valve body, before it leaves its valve seat while simultaneously, reducing the size of the leak cavity can be placed in contact, with the second sliding valve body which is provided with a, tubular extension which exits the valve housing in a sealed manner and connects 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
- Filed September 16, 1994 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 16, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 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.