Metal wood type golf club head with integral upper internal weighted mass
Patent 5004241 Issued on April 2, 1991. Estimated Expiration Date: 
March 5, 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.
March 5, 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.Patent References 1568888 2550846 3468544 3814437 Golf wood, or iron, club Golf club head structure Distance golf clubs Metal golf driver Golf club head Patent #: 4828265 InventorApplicationNo. 489253 filed on 03/05/1990US Classes:473/327, Reduced air resistance473/345Hollow bodyExaminersPrimary: Coven, Edward M.Assistant: Passaniti, Sebastiano Attorney, Agent or FirmForeign Patent References
International ClassA63B 053/04AbstractA metal wood type golf club head is formed of a metal shell including a hollow interior having a first wall thickness. An elongated mass is integrally formed on the underside of the upper surface having a second thickness which extends into the hollow interior of the metal shell locating the center of gravity of the club head in a direction toward the upper surface of the club head.Other References
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