Thread-forming sheet screw
CA 1053040 A · Owner: Hirabayashi, Fumio · Inventors: Hirabayashi, Fumio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved thread-forming sheet screw is provided. It includes a screw head and a threaded shank formed of a blank by rolling and connected at its top to the screw head. A substantially pyramidal end extends integrally from a bottom of the threaded shank to terminate in a point with a maximum diameter of such pyramidal end being not larger than a blank diameter of the blank. The pyramidal end has a tip portion disposed adjacent the point and a base portion disposed between the tip portion and the bottom of the threaded shank, the tip portion being of a substantially regular polygon in cross section having at least five edges and at least five flat sides extending divergently from the point …
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
- Granted April 24, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 24, 1996.
- 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.