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US4874171A Expired / Lapsed US ⏱️ 0.0 years remaining

Golf club set

Assignee: Bridgestone Corp
•
Filing: 1987-09-10
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Granted: 1989-10-17
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Expires: 2007-09-10
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Abstract

Abstract The golf club set according to the present invention consists of plural golf clubs of which the lofts are increased iron a predetermined order, preferably with increments of 3 DEG to 4 DEG . The heads of golf clubs with lofts ranging from 9 DEG to 25 DEG in the set being constructed with a sole plate attached to a shell of a synthetic resin and integrally formed with a core, the heads of golf clubs with lofts ranging from 22 DEG to 31 DEG being constructed with a shell of a synthetic resin, core and sole plate formed integrally with one another, and the heads of golf clubs with lofts ranging from 28 DEG to 50 DEG being constructed with a mass of a high specific gravity synthetic resin and a sole plate molded integrally with each other.

Inventors

  • 👤 Hiroshi Ezaki
  • 👤 Yoneji Kobayashi
  • 👤 Katsumi Iida

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 14:55
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0416; A63B53/0466; A63B53/047; A63B60/00; A63B2209/00; A63B2209/02; A63B2209/023; A63B53/005; A63B53/0408; A63B53/0412; A63B53/042; A63B53/0433

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 343 words
A golf club set comprising first, second and third groups of golf clubs, each of the clubs in the set comprising a shaft connected to a head at one end of said shaft, each of the heads having a hitting face for hitting a golf ball, said hitting face being inclined to define a loft angle, each of the clubs of the set having said loft angle selected from the range of 9° to 50°, the loft angle of each of the clubs in the set being different and increasing within said first, second and third groups, each of the clubs having a shaft length decreasing from club to club as the loft angle increases from club to club, each of the heads having a center of gravity a distance Z from the hitting face and located within the head, the distance Z decreasing from club to club as the loft angle increases from club to club, each golf club head of the first group of golf clubs having a loft angle selected in the range of from 9° to 25°, each golf club head of the first group of clubs being constructed with a sole plate attached to a first group shell molded of a synthetic resin, a filled cavity formed within the first group shell, each golf club head of the second group of golf clubs having a loft angle selected in the range of from 22° to 31° and being constructed with a seconnd group shell of a synthetic resin, a filled cavity formed within the second group shell and a sole plate integrally molded with the second group shell, and each golf club head of the third group of golf clubs having a loft angle selected in the range of from 28° to 50° and being constructed with a solid means of synthetic resin having a relatively high specific gravity as compared to the synthetic resin of the first group shell and the second group shell, and a sole plate integrally molded with the solid mass of synthetic resin.
Claim 2
Dependent Claim 343 words
A golf club set comprising first, second and third groups of golf clubs, each of the clubs in the set comprising a shaft connected to a head at one end of said shaft, each of the heads having a hitting face for hitting a golf ball, said hitting face being inclined to define a loft angle, each of the clubs of the set having said loft angle selected from the range of 9° to 50°, the loft angle of each of the clubs in the set being different and increasing within said first, second and third groups, each of the clubs having a shaft length decreasing from club to club as the loft angle increases from club to club, each of the heads having a center of gravity a distance Z from the hitting face and located within the head, the distance Z decreasing from club to club as the loft angle increases from club to club, each golf club head of the first group of golf clubs having a loft angle selected in the range of from 9° to 25°, each golf club head of the first group of clubs being constructed with a sole plate attached to a first group shell molded of a synthetic resin, a filled cavity formed within the first group shell, each golf club head of the second group of golf clubs having a loft angle selected in the range of from 22° to 31° and being constructed with a seconnd group shell of a synthetic resin, a filled cavity formed within the second group shell and a sole plate integrally molded with the second group shell, and each golf club head of the third group of golf clubs having a loft angle selected in the range of from 28° to 50° and being constructed with a solid means of synthetic resin having a relatively high specific gravity as compared to the synthetic resin of the first group shell and the second group shell, and a sole plate integrally molded with the solid mass of synthetic resin.
Claim 3
Dependent Claim 39 words
A golf club set according to claim 1, in which each filled cavity is made of a light-weight synthetic resin of less than 0.6 in specific gravity, each first group shell and second group shell containing a reinforcing fiber.
Claim 4
Dependent Claim 28 words
A golf club set according to claim 1, said high specific gravity resin containing a reinforcing fiber and a high specific gravity powder such as a metal powder.

References Cited (Backward Citations)

US3984103A Cited
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US4451042A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-16 1993-04-17 1993-10-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-16 1997-04-17 1997-10-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-16 2001-04-17 2001-10-17 $7700.00 Window Closed / Lapsed

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