Pipe fitting
CA 2058995 C · Owner: Muto, Masaaki · Inventors: Muto, Masaaki; Kimura, Yasuhito
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipe fitting for use with fluid-holding apparatus has a thread that matches any of several different types of pipe threads of the same diameter. Imperfect sealing is eliminated by simple means by taking adv.antage of a small chamfered area that is provided at the outer end of an internally threaded bore. An external thread matching several different types of internal pipe threads of the same diameter has a flared surface tapered at an angle of approximately 90 degrees at its base. A sealing member 22 to seal the clearance between thP pipe fitting and the internal thread ;n the fluid-holding apparatus is provided at a point corresponding to the chamfered area 24 that is positioned slightly …
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 April 12, 1991 and granted March 11, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 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.