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:
Apr. 20, 1999
Filed:
Aug. 01, 1997
John M Hallis, Buffalo, MN (US);
Richard W Proulx, Forest Lake, MN (US);
Federal Cartridge Company, Anoka, MN (US);
Abstract
A method of forming a frangible metal bullet core comprising providing an elongated inner heart member made up initially of a bundle of parallel zinc wires, twisting a plurality of zinc wires tightly around that bundle in a spiral path to cause the wires to inter-engage, deform and cohere to each other, and thereafter swaging the inter-engaged wires into the shape of a bullet core to cause the core, upon striking a target, to disintegrate into fragments smaller than the individual wires. Although copper, iron, and steel wires may be used, zinc made up of 99.99% pure zinc has been found to be preferable for forming such a core.