Improving fatigue life of holes
CA 2121120 A1 · Owner: Wong, Albert Koon-Siu · Inventors: Rajic, Nikolas; Wong, Albert Koon-Siu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of improving the fatigue life of holes and cut-out portions formed in material sheet wherein on at least one area on the sheet where a hole is to be formed or a hole for the cut-out portion is to be formed the sheet is, compressed, and most preferably forming indentations from said compression, on at least one side, and preferably two sides of the material sheet. The process is generally applicable but is, particularly useful where the sheet is to be used in high fatigue loading and stress conditions, such as aircrafts. The invention also provides for an apparatus for improving the fatigue resistance of holes and cut-out portions in material.
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 November 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2014.
- 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.