The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 12, 1978
Filed:
Nov. 09, 1977
Charles H Deveney, Lower Burrell, PA (US);
Aluminum Company of America, Pittsburgh, PA (US);
Abstract
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.degree. to 34.degree.. The thin wall shell is formed by displacing the blank through the die by action of a punch.