Golf club set and method of making
Patent 3963236 Issued on June 15, 1976. Estimated Expiration Date: 
June 15, 1993. 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.
June 15, 1993. 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 ReferencesInventorApplicationNo. 066186 filed on 08/24/1970US Classes:473/289, Particular correlated shaft flexural characteristic29/428, Assembling or joining29/557, Shaping one-piece blank by removing material473/291, Mass distribution473/409MethodExaminersPrimary: Apley, Richard J.Attorney, Agent or FirmInternational ClassA63B 53/00 (20060101)AbstractA matched and correlated set of golf club irons is produced by preparing a series of shafts which vary substantially uniformly in flexibility and securing the most flexible shaft to the lowest numbered head in the set, securing the next less flexible shaft to the next higher numbered head, and repeating the process until all the shafts and heads are joined. The shafts are prepared by providing a first group of basic stock shafts of substantially identical stiffness characteristics and cutting off the tip ends in uniformly increasing increments to vary the flexibility. The first group of shafts is connected to heads from the lowest number to one of the middle distance irons. A second group of basic stock shafts having identical stiffness characteristics greater than the first group is similarly prepared and provided for the higher numbered heads. Each successive head is heavier than the preceding head by an increment sufficient to produce a gradual increase in swing weight from the lowest to the highest numbered iron in the set.Other References
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