US4803023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a wood-type golf club head
Assignee: Yamaha Corp
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Filing: 1987-02-19
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Granted: 1989-02-07
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Expires: 2007-02-19
Abstract
Abstract In production of a wood-type golf club head having a FRP shell and a foam resin core, a seat hole is formed in the sole portion of the club head and closed by a support plate having a threaded through hole at the center of gravity thereof; foamable resin is infused into the FRP shell cavity in the form of fine beads or solution, a plug as a weight balance adjusting piece is screwed into the support plate in direct contact with the foam resin core for secure holding of the weight balance adjusting piece during use of the club.
Inventors
- 👤 Koichi Enomoto
- 👤 Tatsuo Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:44
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0466; A63B60/00; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/18; A63B53/0433; B29L; B29L2031/00; B29L2031/52; B29L2031/5227
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
Method for producing a wood-type golf club head comprising the steps of preparing a FRP shell having a cavity and defining a bottom section, forming a seat hole in said bottom section of said FRP shell, securedly closing said seat hole with a support plate having a threaded through hole at the position of the center of gravity thereof, infusing foamable resin into said cavity of said FRP shell via said threaded through hole, screwing a plug of a selected weight into said threaded through hole, and developing foaming and hardening of said foamable resin for conversion into foam resin.
Claim 2
Dependent Claim
100 words
Method for producing a wood-type golf club head comprising the steps of preparing a FRP shell having a cavity and defining a bottom section, forming a seat hole in said bottom section of said FRP shell, securedly closing said seat hole with a support plate having a threaded through hole at the position of the center of gravity thereof, infusing foamable resin into said cavity of said FRP shell via said threaded through hole, screwing a plug of a selected weight into said threaded through hole, and developing foaming and hardening of said foamable resin for conversion into foam resin.
Claim 3
Dependent Claim
19 words
Method as claimed in claim 1 in which said step of infusing includes infusing solution of said foamable resin.
Claim 4
Dependent Claim
19 words
Method as claimed in claim 1 in which said step of infusing includes infusing beads of said foamable resin.
Claim 5
Dependent Claim
27 words
Method as claimed in claim 1, 2 or 3 in which the apparent specific gravity of said foam resin is in a range from 0.05 to 0.45.
Claim 6
Dependent Claim
36 words
Method as claimed in claim 1, 2 or 3 in which a filler is added to said foam resin and the apparent specific gravity of said foam resin is in a range from 0.05 to 1.5.
References Cited (Backward Citations)
GB397252A
Cited
US3582081A
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US4043563A
Cited
JPS5121436A
Cited
US4313607A
Cited
US4489945A
Cited
US4451041A
Cited
US4553755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |