Lead-free bullet

• US 6,257,149 B1
• Filed: 10/05/1998
• Issued: 07/10/2001
• Est. Priority Date: 04/03/1996
• Status: Expired due to Term

• Current Assignee: Cesaroni Technology Incorporated
• Original Assignee: Cesaroni Technology Incorporated
• Inventors: Cesaroni, Anthony J.
• Primary Examiner(s): Carone, Michael J.
• Assistant Examiner(s): FELTON, AILEEN BAKER
• Application Number:
  US09/101,844
• Time in Patent Office: 1,009 Days
• Field of Search: 102/514, 102/515, 102/516, 102/517, 264/267, 264/296
• US Class Current: 102/515
• CPC Class Codes: F42B 12/745 the core being made of plastics; Compounds or blends of plastics and other materials, e.g. fillers

Abstract

A bullet that will retain markings from a firearm barrel when fired from such firearm. The bullet comprises a right cylindrical core with opposed ends, one such opposed end having a tapered section integrally connected thereto. The core is formed from a lead-free composition of a polymer and filler and selectively retains it'"'"'s integrity when fired from the firearm or is frangible. The right cylindrical core has a jacket that is cylindrical and formed from a thermoplastic polymer or copper. The thermoplastic polymer has a softening point above firearm barrel temperatures.

Claims

1. A bullet that will retain markings from a firearm barrel when fired from such firearm, comprising:

a right cylindrical core with opposed ends, one such opposed end having a tapered section integrally connected thereto, said core being formed from a lead-free composition comprising a filler and a polymer, said polymer being selected from the group consisting of amorphous polymers, low crystallinity polymers and combinations thereof, said composition retaining its integrity when fired from the firearm, said right cylindrical core having a jacket that is cylindrical and formed from a thermoplastic polymer or copper, said thermoplastic polymer having a softening point above firearm barrel temperatures, the adhesion between the jacket and the core being sufficient to retain the integrity of the bullet on firing until impact, said bullet having a weight that is at least 80% that of a comparable bullet for such firearm, said comparable bullet being formed from lead.

2. The bullet of claim 1 in which the weight is at least 85% of the comparable lead bullet.

3. The bullet of claim 1 in which the jacket and core separate on impact.

4. The bullet of claim 1 in which the mass of the bullet is sufficient to actuate firearm reloading mechanisms.

5. The bullet of claim 1 in which the tapered section is a truncated cone or truncated parabellum.

6. The bullet of claim 1 in which the bullet has a tip that is parabolic, rounded or a hollow point.

7. The bullet of claim 1 in which the jacket of the bullet extends over the tapered section attached to one end of the right cylindrical core.

8. The bullet of claim 1 in which the other of the opposed ends is a truncated tapered section.

9. The bullet of claim 1 in which the polymer of the core is an ionomer.

10. The bullet of claim 1 in which the polymer of the core is selected from ethylene/methacrylic acid copolymer ionomers, polyetherester elastomers and polyamides.

11. The bullet of claim 1 in which the polymer of the core is an ethylene/ methacrylic acid copolymer ionomer.

12. The bullet of claim 1 in which the polymer of the core is polyamide.

13. The bullet of claim 1 in which the polyamide is nylon 11.

14. The bullet of claim 1 in which the filler is particles of copper.

15. The bullet of claim 1 in which the filler is selected from the group consisting of tungsten, bismuth, tin and stainless steel.

16. The bullet of claim 1 in which the bullet retains markings from the barrel of said firearm.

17. The bullet of claim 1 in which the jacket at the other of the opposed ends is curled inwards towards the tip.

18. The bullet of claim 17 in which the remainder of said end is free of jacket.

19. The bullet of claim 1 in which the jacket is copper.

20. The bullet of claim 1 in which the jacket is a thermoplastic polymer.

21. A bullet of claim 1 in a shell, said bullet being capable of being inserted into a firearm and fired therefrom.