Intrados induction heating for tight radius rotary draw bend
CA 2259731 C · Owner: Talley, Laroul J. · Inventors: Talley, Laroul J.; Yurek, Theodore F.; Ziegler, Douglas D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A boost bend method of making tight radius bends in boiler tubes, such as bends having a radius of lxD or less in which a selected portion of the intrados of the tube is heated in a controlled manner thereby reducing the necessary tube wall thickness relative to the diameter of the tube for 180° bends. Tubes bent using the method may have wall thicknesses of about 6.6% of the tube diameter and suffer less than about 7% thinning of the extrados tube wall.
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 January 20, 1999 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2021.
- 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.