Valve device
CA 2127280 C · Owner: Nakamura, Kazuyoshi · Inventors: Nakamura, Kazuyoshi; Nakamura, Mitsuyo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To improve the cut-off characteristics and operability of a valve device by providing the valve device with a valve body which is hardly hurt by the extraneous matter entering the same and which has a high mechanical strength including high creep resistance, without increase in the roughness of the slide surface of the valve body while the valve device is in use. A valve seat (6) and a valve body (7) slidably placed on the valve seat are provided with notched flow passages (15) or inflow passages (13, 14), and these valve seat (6) and valve body (7) are formed out of a molded body of a resin composition consisting of 35-90 % by weight of polycyanoarylether resin and 10-65 % by weight of …
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 29, 1993 and granted March 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 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.