Method of manufacturing tee nut
CA 2118732 C · Owner: Nagayama, Yutaka · Inventors: Nagayama, Yutaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A swollen portion is formed on a metal plate so that a through hole is formed in the forward end surface of this swollen portion, and thereafter a forward end portion of the swollen portion is relatively reduced in outer diameter as compared with a base portion so that the, forward end portion is relatively reduced in thickness. Then the outer and inner diameters of the base portion are reduced while substantially maintaining its thickness. Thus the forward end portion defines a relatively thin portion to be caulked, and the base portion defines a relatively thick female screw forming portion. Thus it, is possible to form a shaft portion having a uniform outer diameter and comprising the …
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 March 10, 1994 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2016.
- 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.