ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,544,640, issued on Feb. 10.
"Baseball swing training device" was invented by Brian Daley (St. Augustine, Fla.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention is directed to a baseball swing training device that helps batters perfect their swing mechanics when hitting a baseball or a softball. The baseball swing training device may include an elongate member and a plurality of protrusions extending from the elongate member. The elongate member may be length-adjustable, such as by including a locking mechanism which may engage with a plurality of apertures, such that the extendable device may accommodate users of various wingspans. Th...