Patent 5158297 Issued on October 27, 1992. Estimated Expiration Date: December 17, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
473/238, Adjustable implement or static position indicator (e.g., with respect to the golfer, projectile, target, etc.)473/201Hand on grip positioning aid or grip indicator
Golf clubs are disclosed that exhibit at least one marking indicia on the surface of the shaft and extending along at least one of the lateral sides of the shaft. The marking indicia is preferably a series of lines that are parallel to the edge of the shaft and separated by a distance sufficient to be revealed or hidden as the club face is opened or closed by small angular increments.Golf shafts according to the invention include:a shaft having a circular cross section and comprising (a) a tip end for attaching a club head to the shaft, (b) a butt end for attaching a grip to the shaft, and (c) at least one linearly oriented first alpha marking indicia positioned on the exterior of the shaft within an angle, , about 45° to about 135° from a clockwise position relative to top dead center of the shaft and extending up the shaft away from the tip end for a distance sufficient to allow a golfer to view the marking indicia and discern an angular position of the club face of up to about 15° relative to a square alignment.The present invention provides a shaft having alignment indicia that are convenient and reproducibly used to produce a square, slice, or hook shot. Having the indicia located within the lower half of the shaft reduces the need to shift focal point when viewing the indicia thereby assisting the golfer in maintaining concentration when preparing for a shot. The view focus does not need to shift from the club head to an alignment device located on or next to the hand grip. A shaft with a circular cross section permits the use of a plurality of linearly extending indicia that can be positioned to provide a variety of reproducible shots of incremental amounts of hook or slice.