US4714577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a wood-type golf club head
Assignee: Yamaha Corp
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Filing: 1986-09-11
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Granted: 1987-12-22
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Expires: 2006-09-11
Abstract
Abstract In production of a wood-type golf club head having a rigid shell, metal pieces are dispersed in the matrix of crude foamable synthetic resin filled in the interior of a crude rigid shell for long maintenance in position of the center of gravity of the product despite shocks at shooting balls.
Inventors
- 👤 Itsushi Nagamoto
- 👤 Tatsuo Nakanishi
- 👤 Ryohei Tajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:22
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B60/00; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/18; A63B2209/00; A63B2209/02; A63B53/0433; B29L; B29L2031/00; B29L2031/52; B29L2031/5227; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/239
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
An improved method for producing a wood-type golf club head comprising the steps of setting a lid having a threaded hole to a bottom seat hole in a hollow crude shell of a crude golf club head, filling crude foamable synthetic resin of a prescribed amount with metal pieces into the interior of said hollow crude shell via said threaded hole in said lid, and heating said crude golf club head for foaming.
Claim 2
Dependent Claim
73 words
An improved method for producing a wood-type golf club head comprising the steps of setting a lid having a threaded hole to a bottom seat hole in a hollow crude shell of a crude golf club head, filling crude foamable synthetic resin of a prescribed amount with metal pieces into the interior of said hollow crude shell via said threaded hole in said lid, and heating said crude golf club head for foaming.
Claim 3
Dependent Claim
25 words
An improved method as claimed in claim 1 in which said threaded hole in said lid is closed before heating said crude golf club head.
Claim 4
Dependent Claim
25 words
An improved method as claimed in claim 1 in which said threaded hole in said lid is closed after heating said crude golf club head.
Claim 5
Dependent Claim
17 words
An improved method as claimed in claim 1 in which liquid crude foamable synthetic resin is used.
Claim 6
Dependent Claim
17 words
An improved method as claimed in claim 1 in which granular crude foamable synthetic resin is used.
Claim 7
Dependent Claim
27 words
An improved method as claimed in claim 1 in which the volume of said crude shell is in a range from 20 to 90 cm 3 .
Claim 8
Dependent Claim
33 words
An improved method as claimed in claim 1 in which filler is not used and the apparent specific gravity of said crude foamable synthetic resin is in a range from 0.05 to 0.45.
Claim 9
Dependent Claim
32 words
An improved method as claimed in claim 1 in which filler is used and the apparent specific gravity of said crude foamable synthetic resin is in a range from 0.05 to 1.5.
Claim 10
Dependent Claim
23 words
An improved method as claimed in claim 8 in which said filler is taken from a group consisting of barium sulfate and alumina.
Claim 11
Dependent Claim
17 words
An improved method as claimed in claim 1 in which said metal pieces are cylindrical in shape.
Claim 12
Dependent Claim
17 words
An improved method as claimed in claim 1 in which said metal pieces are spherical in shape.
Claim 13
Dependent Claim
30 words
An improved method as claimed in claim 10 in which said metal pieces have a diameter of about 3 mm and a length of from about 5 to 10 mm.
Claim 14
Dependent Claim
20 words
An improved method as claimed in claim 11 in which said metal pieces have a diameter of about 3 mm.
Claim 15
Dependent Claim
50 words
An improved method as claimed in claim 1 in which said filling of crude foamable synthetic resin into the interior of said hollow crude shell is via said threaded hole which is arranged at a location corresponding to the position of the center of gravity of said golf club head.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |