Nut and intermediate product therefor
CA 2273068 C · Owner: Nagayama Electronic Industry Co. Ltd. · Inventors: Nagayama, Yutaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A nut consists of integral metal material and has a female screw thread formed with a rolled tap in a screw hole that opens substantially perpendicularly to an end surface of one end of the nut. A lead thread is located at an opening end of the screw hole and has a shape including a concave curved portion and a linear tapered portion that are continuous with each other and extend along the overall periphery of the opening end of the hole. Due to the special lead thread the first thread formed by the rolled tap adjacent to the lead thread will not have a concave groove along its crest although subsequent threads have such a concave groove along the thread crest as a characteristic of thread …
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 May 27, 1999 and granted August 12, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 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.