A bolt and thread rolling die and the manufacture of the bolt
CA 2394101 C · Owner: Meidoh Co. Ltd. · Inventors: Kato, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The object of the present invention is to provide a bolt that effectively prevents , gouging, seizure and racing between the bolt and nut without the aid of a guide boss and , is effective when combined with the case nut. Said object can be attained by providing a bolt having a threaded shank portion wherein , a plural number of notched faces slanting toward the end of said threaded shank portion , at an angle ranging from ~15° to ~80° toward the axis of said threaded shank , portion, are formed at the beginning of the thread part of said threaded shank portion.
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 July 18, 2002 and granted March 15, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 18, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 18, 2024.
- 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.