On/off valve capable of drawing back fluid when closed
CA 2106326 C · Owner: Murate, Masashi · Inventors: Yamasaki, Isamu; Murate, Masashi; Tomita, Ichio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An OFF/OFF valve including a fluid passage formed in the valve body (51), and having a valve seat (55) a, smaller diameter portion (56) extending from the valve seat (55) on a downstream side of the valve seat (55) and a, larger diameter portion (57) extending from the smaller diameter portion (56) on a downstream side of the smaller diameter portion (56). A valve element (58) is disposed so as to be movable between a position adjacent the valve seat (55) and a position within the larger diameter portion (57). The valve element (58) is driven by a valve element driving assembly. When the valve is closed, the valve element (58) moves toward the valve seat (55). When the valve element (58) …
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, 1993 and granted July 22, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 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.