Golf putter system
Patent 5244210 Issued on September 14, 1993. Estimated Expiration Date: 
September 21, 2012. 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.
September 21, 2012. 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.Patent References 1167387 1840924 2750194 2859972 3884477 3909005 Adjustably-weighted golf irons and processes Adjustable putter blade sight Golf club heads with adjustable weighting Golf club InventorApplicationNo. 947474 filed on 09/21/1992US Classes:473/252, Horizontally spaced linear indicia perpendicular to projectile striking face473/336Elongated horizontal boreExaminersPrimary: Grieb, William H.Assistant: Passaniti, Sebastiano Attorney, Agent or FirmForeign Patent References
International ClassesA63B 053/04A63B 053/08 162 R AbstractA golf club head, particularly a putter, having an improved selectable weight and adjustable balance system. The head has an elongated threaded weight chamber extending from toe to heel. The chamber contains weights, preferably coins, and thrust/ friction washers which are captured and secured by opposing threaded end plugs. The amount of weights used and their collective effective center of gravity is adjustable by the user. The center of gravity or sweet spot is adjusted when the end plugs along with the captive weights and washers are rotated toward the toe or heel. When rotated toward each other, the end plugs produce a strong locking force on the entire weight assembly. The balance and sweet spot characteristics are also controlled by the strategic placement of weights within the chamber. The washers can also be used as spacers to aid weight distribution. When more weight separation is required, an optional compression spring is used between weights. By selecting the amount of weights deployed and by the strategic placement of the weights, many options of putter head weight and balance are available to the golfer.Other References
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