Blanking and forming tapered wall articles
CA 1081549 A · Owner: Aluminum Company Of America · Inventors: Deveney, Charles H. Jr.; Kolakowski, Ronald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Elongated, thin wall shells are formed from substantially circular blanks cut from sheet material by steps including providing a blank in a blank holder on a die having an effective entrance and exit aperture, the entrance aperture having an extent substantially commensurate in size with the size of the blank to be drawn, the die having a cavity the wall of which, converges inwardly from the entrance aperture to the effective exit aperture. The wall connecting the entrance and exit apertures is defined by an arc of a sector of a circle the sector, having an angle in the range of 12 to 34°. The thin wall shell is formed by displacing the blank through the die by action of a punch.
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 July 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 15, 1997.
- 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.