Method of and apparatus for estimating life expectancy of mechanical structures
CA 1250367 A · Owner: Hitachi, Ltd. · Inventors: Toriya, Hajime; Usami, Saburo; Tsubouchi, Kuniyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of and an apparatus for estimating the life expectancy of mechanical structures to which a repeated load is applied. The relation between the length of the greatest crack formed in the material to be estimated and the life ratio of such material is obtained beforehand by using test pieces of the material and the length, of the greatest crack formed at the surface of the material is estimated by an extreme value statistical process from the lengths of the greatest cracks each formed at one of several sampling faces of the material. The life expectancy of a mechanical structure is estimated based on the estimated length of the greatest crack and the life ratio.
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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
- Granted February 21, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 21, 2006.
- 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.