Abstract: Tubular baseball bats comprised of an elongated handle portion and a striking or barrel portion wherein the barrel portion has variable stiffness along its length. One such bat has a circumferential low cost, low weight stiffener generally located in the sweetspot area designed to increase radial stiffness in a controlled manner which results in decreasing the bat performance to meet a changed bat performance standard and can be applied at low cost to both used field returned bats and bats being newly manufactured. Further, new tubular polymer composite bats can be designed with increased radial stiffness generally located in the sweetspot area or with radial stiffness graduated from highest, generally in the sweetspot area, to lowest at the barrel ends. All bats of the present invention result in calculated bat performance to meet applicable regulatory standards while also increasing the sweetspot size.

Abstract: A tubular baseball bat comprising a substantially full length core shaft of preferably constant cross-section, including a handle portion, and a barrel with a gap or separation between the core shaft and barrel, the core shaft and barrel being connected at two or more locations. Embodiments include bats with long barrels without taper sections, bats with taper sections integral with the barrels, bats with separate taper sections which may be of non-circular cross-section, bats with flexible circumferential connecting structures, bats with folded barrel end portions, and bats with resilient means between the core shaft and barrel. Such bats can have larger hitting areas, larger sweetspots, higher performance, and provide minimal sting to a player's hands.

Abstract: A baseball bat having a lightweight core comprised of an elongated handle portion and a striking portion, wherein the handle portion and/or the striking portion is/are over wrapped with a singular thin external polymer composite skin bonded with resin directly and rigidly to the core forming a structural sandwich resulting in reduced weight, improved strength, stiffness and durability, thereby providing increased bat speed and improved hitting distances.

Abstract: A single member tubular baseball or softball bat of unitary construction comprised of an elongated handle portion and a striking or barrel portion wherein the barrel portion has internal and external cylindrical layers separated by one or more separation barriers, which are not bonded to said layers, located internally within the barrel thickness, and being in intimate contact with these layers. This results in equivalent or higher performing baseball bats than the prior art, as measured by hitting distance, and more consistent performance. The bats are also less costly to manufacture than prior art double walled bats.

Abstract: A baseball bat having a lightweight core comprised of an elongated handle portion and a striking portion, wherein the handle portion and/or the striking portion is/are over wrapped with a singular thin external polymer composite skin bonded with resin directly and rigidly to the core forming a structural sandwich resulting in reduced weight, improved strength, stiffness and durability, thereby providing increased bat speed and improved hitting distances.

Abstract: A baseball bat is described having of an elongated cylindrical handle portion for gripping, a cylindrical barrel portion for striking and a tapered cylindrical mid-section connecting the handle portion and the barrel portion, wherein at least the barrel portion is tubular and is constructed solely of a polymer composite material with a three-dimensional fiber reinforcement architecture resulting in improved durability versus conventional polymer composite bats, without any sacrifice in playing performance. Also disclosed are polymer composite baseball bats where the polymer composite material includes between 85% and 100% fiberglass reinforcement fibers, and/or where the central cavity is filled with a damping material such as polymeric foam or a low-density granular material.