Apparatus for controlled delivery of liquids
CA 2086753 C · Owner: Hjertman, Birger · Inventors: Hjertman, Birger; Michel, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for controlled delivery of a liquid consists of a delivery unit which, comprises a liquid container (3) having at least one movable wall (12) and a liquid outlet, which is provided with a flow restriction and a power unit which comprises a , second container (21) which also has at least one movable wall (29) and wherein a vacuum may be, established, and a mechanical coupling (31) between the movable wall (12) of the liquid, container (3) and the movable wall (29) of the second container (21). The delivery unit, and the power unit are connected together coaxially when the apparatus is prepared for, delivery, and in this connecting together the movable wall (29) of the …
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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 July 25, 1991 and granted May 7, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 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.