System comprising a container having a slit valve as a venting valve and a liquid contained in said container
CA 2089458 C · Owner: Declerck, Johan Willy · Inventors: Bilani, Nadi; Hoernaert, Jorgen; Declerck, Johan Willy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a system comprising a container and a liquid contained therein that builds up a gas or vapour pressure a sealing valve, having a concave shaped portion and a slit extending through said portion, allows venting of the vapour from the container to the ambient at a predetermined vapour threshold pressure. The vapour threshold pressure at which the slit opens for venting can be adjusted by valve restraining means which are preferably formed by a protrusion at the inside of a cap covering the sealing valve. The vapour threshold pressure at which venting takes place, can to a large extent be adjusted without affecting the dispensing characteristics of the valve.
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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 12, 1993 and granted August 4, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2015.
- 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.