Water-control stopper
CA 2037602 A1 · Owner: Shih, Sen-Tien · Inventors: Shih, Sen-Tien; Shih, Sen-Tien
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water-control stopper comprises a stopper body (30) an I-shaped valve (32) and a hut (31). It is characterized in that it has a simple structural framework which can be manufactured easily at a relatively low cost and that either a rigid tube or a soft tube is applicable.
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 March 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 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.