Patent US4798384A successfully refreshed from Google Patents.
US4798384A
Expired / Lapsed
US
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Club-head
Assignee: Maruman Golf Co Ltd
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Filing: 1987-05-27
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Granted: 1989-01-17
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Expires: 2007-05-27
Abstract
Abstract A club-head (11) for an iron golf club in which the outer shell (13) and core body (14) of the club-head are formed of metals having a different specific weight from each other. The weight of the embedded core body is concentrated at the center of the hitting portion of the club head. This allows an improvement in the weight distribution and disposition of the center of gravity of the club-head (11), and since the outer shell (13) is made of a metal, prevents scratching and cracking of the surface of the outer shell (13).
Inventors
- 👤 Masashi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:02
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0458; A63B53/047; A63B53/0487; A63B60/00; A63B53/0416; A63B53/045; A63B53/0454; A63B53/0462
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
A club-head for a gold club made of metal comprising an outer shell which includes the striking face of the club head and is made of a first metal and a core body made of a second metal, said first metal having different specific weight from said second metal, said core body having a sole and a protrusion extending integrally and upwardly from said sole into said outer shell, said sole being exposed outside of substantially the whole bottom of said outer shell, said protrusion being embedded in said metal of said outer shell and having a size and upward extent such that the weight of said core body is concentrated at substantially the center of the hitting portion of said club head, said core body being integrally secured to said outer shell substantially by said embedded protrusion.
Claim 2
Dependent Claim
138 words
A club-head for a gold club made of metal comprising an outer shell which includes the striking face of the club head and is made of a first metal and a core body made of a second metal, said first metal having different specific weight from said second metal, said core body having a sole and a protrusion extending integrally and upwardly from said sole into said outer shell, said sole being exposed outside of substantially the whole bottom of said outer shell, said protrusion being embedded in said metal of said outer shell and having a size and upward extent such that the weight of said core body is concentrated at substantially the center of the hitting portion of said club head, said core body being integrally secured to said outer shell substantially by said embedded protrusion.
Claim 3
Dependent Claim
27 words
A club-head as defined by claim 1, wherein said core body is formed of a metal having a larger specific weight than that of said outer shell.
Claim 4
Dependent Claim
27 words
A club-head as defined by claim 1, wherein said core body is formed of a metal having a smaller specific weight than that of said outer shell.
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US2014829A
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US2328583A
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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) | 1992-01-17 | 1992-07-18 | 1993-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-17 | 1996-07-18 | 1997-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-17 | 2000-07-18 | 2001-01-17 | $7700.00 | Window Closed / Lapsed |