Reduced friction projectile

Ammunition and explosives – Projectiles – Composite

Reexamination Certificate

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C102S525000, C102S524000, C102S517000

Reexamination Certificate



A projectile includes a leading part formed by a tip, a tip base, and a leading rod. A trailing part includes a main base, a truncate base, and a trailing rod. A leading end of a cylindrical interface abuts an annular shoulder where the tip meets the tip base and a trailing end abuts an annular shoulder where the main base meets the truncate base. The tip base and the truncate base respectively support the leading and trailing ends of the cylindrical interface. A medial extent of the cylindrical interface is unsupported by the leading and trailing rods and is deformed radially inwardly by lands in a barrel when the projectile is fired. The leading and trailing ends of the cylindrical interface maintain contact with the lands and the medial extent does not, reducing friction between the projectile and the barrel without sacrificing spin of the projectile.

patent: 40153 (1863-10-01), Billings
patent: 2322751 (1943-06-01), Studler
patent: 2946261 (1960-07-01), Crockett
patent: 3348486 (1967-10-01), Rapp
patent: 3913489 (1975-10-01), Travor et al.
patent: 3952657 (1976-04-01), Kaltmann
patent: 5686693 (1997-11-01), Jakobsson
patent: 6305293 (2001-10-01), Fry et al.
patent: 6317946 (2001-11-01), Beal
patent: 6439125 (2002-08-01), Carter
patent: 7207275 (2007-04-01), Oertwig
patent: 7219607 (2007-05-01), Oertwig
patent: 7222573 (2007-05-01), Pontieri
patent: 7451706 (2008-11-01), Meyer
patent: 7748325 (2010-07-01), Marx
patent: 2005/0183617 (2005-08-01), MacDougall
patent: 2006/0027128 (2006-02-01), Hober
patent: 2007/0089628 (2007-04-01), Elder
patent: 2007/0089629 (2007-04-01), Marx


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