Iron type golf club head
Patent 5601501 Issued on February 11, 1997. Estimated Expiration Date: 
October 2, 2015. 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.
October 2, 2015. 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.InventorAssigneeApplicationNo. 538296 filed on 10/02/1995US Classes:473/350Recess or cavity behind striking faceExaminersPrimary: Marlo, George J.Attorney, Agent or FirmForeign Patent References
International ClassA63B 053/04Foreign Application Priority Data1995-08-01 JPAbstractAn iron-type golf club head having plural cavities formed in a back surface of a head body. A back surface 1A of a metallic head body 1 is formed with plural cavities 5, each being formed semispherical and opposite to a face 4 of the head body 1. The cavities 5 are formed by forging, thus forming even and fine tissues and grain flow. Further, according to a preferred embodiment of the invention, the cavities 5 are disposed regularly on the back surface 1A Accordingly, the toughness and durability of material can be enhanced, so that face 4 can be made thinner to a 1.0 to 3.5 mm thickness for optimal weight distribution. As a result, a larger sweet area can be realized without damaging a strength of head. | |
