US4848747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Set of golf clubs
Assignee: Yamaha Corp
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Filing: 1987-10-23
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Granted: 1989-07-18
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Expires: 2007-10-23
Abstract
Abstract A metallic golf club head having a rear side recess and a synthetic backing situated in the rear side recess, wherein the position of the rear side recess is selectively offset towards the toe of the golf club head in a short club and towards the heel of the golf club head in a long club so as to selectively position the center of gravity of the golf club head and thereby provide a more stabilized course of travel for a ball impacted by the golf club head, increase the distance traveled by a ball impacted by the golf club head and provide a crisp feel when a ball is impacted by the golf club head.
Inventors
- 👤 Masaki Fujimura
- 👤 Toyohiko Tadokoro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:07
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/047; A63B60/00; A63B2209/00; A63B2209/02; A63B53/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
239 words
A set of metallic golf clubs having shafts varying in length from short to long, each said golf club having a golf club head, said golf club heads having blade lofts varying in degree from low for the golf clubs having longer shafts to high for the clubs having shorter shafts, each said golf club head comprising a main body member having a front side, a rear side, a toe, a heel and a predetermined central location centrally located between said toe and said heel, said rear side including a recess, said front side including a wall section having an inner surface in communication with said recess and a shooting surface remote from said inner surface, said recess having a predetermined length defined by two recess ends and a recess center between said recess ends, said recess center being in a predetermined offset position with respect to said predetermined central location thereby offsetting said recess, the golf club heads of the golf clubs having shorter shafts and higher blade lofts having said recess offset towards the toe and the golf club heads of the golf clubs having longer shafts and lower blade lofts having said recess offset towards the heel, thereby selectively providing the optimum center of gravity for each golf club head so that a ball struck with the shooting surface of any golf club head in said set of golf clubs will travel a substantially stabilized course.
Claim 2
Dependent Claim
239 words
A set of metallic golf clubs having shafts varying in length from short to long, each said golf club having a golf club head, said golf club heads having blade lofts varying in degree from low for the golf clubs having longer shafts to high for the clubs having shorter shafts, each said golf club head comprising a main body member having a front side, a rear side, a toe, a heel and a predetermined central location centrally located between said toe and said heel, said rear side including a recess, said front side including a wall section having an inner surface in communication with said recess and a shooting surface remote from said inner surface, said recess having a predetermined length defined by two recess ends and a recess center between said recess ends, said recess center being in a predetermined offset position with respect to said predetermined central location thereby offsetting said recess, the golf club heads of the golf clubs having shorter shafts and higher blade lofts having said recess offset towards the toe and the golf club heads of the golf clubs having longer shafts and lower blade lofts having said recess offset towards the heel, thereby selectively providing the optimum center of gravity for each golf club head so that a ball struck with the shooting surface of any golf club head in said set of golf clubs will travel a substantially stabilized course.
Claim 3
Dependent Claim
39 words
The set of golf clubs claimed in claim 1, wherein each golf club head includes a reinforcement member connected to the inner surface within said recess so as to form a composite front side of said golf club head.
Claim 4
Dependent Claim
24 words
The set of golf clubs claimed in claim 2, wherein said reinforcement member in each said golf club head is a fiber reinforced plastic.
Claim 5
Dependent Claim
25 words
The set of golf clubs claimed in claim 2, wherein said reinforcement member in each said golf club head is a carbon fiber reinforced plastic.
References Cited (Backward Citations)
US4715601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |