US4690408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Club-head
Assignee: Maruman Golf Co Ltd
•
Filing: 1986-03-10
•
Granted: 1987-09-01
•
Expires: 2006-03-10
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 in an area defining the periphery 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 11:10
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0416; A63B53/045; A63B53/0454; A63B53/0458; A63B53/0462; A63B53/047; A63B53/0487; A63B60/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
A club-head for a golf club made of metal comprising an outer shell made of a first metal and a core body embedded in said outer shell made of a second metal, said first metal having a different specific weight from said second metal, and the weight of said core body being concentrated in an area defining the periphery of the hitting portion of the club-head.
Claim 2
Dependent Claim
66 words
A club-head for a golf club made of metal comprising an outer shell made of a first metal and a core body embedded in said outer shell made of a second metal, said first metal having a different specific weight from said second metal, and the weight of said core body being concentrated in an area defining the periphery of the hitting portion of the club-head.
Claim 3
Dependent Claim
24 words
A club-head as defined by claim 1, wherein said core body has at least a rib located in the hitting portion of the club-head.
Claim 4
Dependent Claim
30 words
A club-head as defined by claim 1, wherein said core body is formed of a second metal having a larger specific weight that said first metal of said outer shell.
Claim 5
Dependent Claim
30 words
A club-head as defined by claim 1, wherein said core body is formed of a second metal having a smaller specific weight that said first metal of said outer shell.
Claim 6
Dependent Claim
27 words
A club-head as defined by claim 1, wherein said core body extends from a heel end of said club-head substantially to the other end of said 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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |