A sealing cap with a one way valve
CA 2109606 A1 · Owner: Closure Technologies, Inc. · Inventors: Cloyd, William C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stopper (12) for hermetically sealing a container (10) containing a liquid sample is provided with an annular body (14) which defines a cavity open at the top end of the stopper. The annular body has upper walls (26) which abut against the inner surface of a container (22) when the stopper (12) is placed in the mouth of the container and downwardly extending lower walls (28) which are spaced from the sides of the container (10) and which define a normally closed slit (32) at the bottom end thereof. The lower walls (28) are connected to flexible but hollows pring elements (34) adapted to abut against the inner wall of the container when the stopper (12) is in the mouth of the container. …
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 18, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2014.
- 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.