Ball valve
CA 2046334 C · Owner: Asahi Yukizai Kogyo Co. Ltd. · Inventors: Yokoyama, Ikuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a ball valve wherein the rotation of a ball (1) provided in a valve chest (8) opens and closes a valve an orifice (4) is provided in a passage (3) of the ball and communicating passages (5) connecting the upstream side of the orifice (4) with the valve chest (8) and communicating passages (6) connecting the downstream side of the orifice with the valve chest (8) are provided. The passage (3) provided in the ball (1) has a large aperture at one end (30) and a small aperture at the other end (31), the respective communicating passages (5) (6) are formed so as to communicate the passage (3) with the valve chest (8) when the valve is opened and the, aperture of the passage (32) whereat a …
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 December 18, 1990 and granted September 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2012.
- 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.