Patent US4890840A successfully refreshed from Google Patents.
US4890840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood-type golf club head for number one golf club
Assignee: Maruman Golf Co Ltd
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Filing: 1988-02-23
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Granted: 1990-01-02
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Expires: 2008-02-23
Abstract
Abstract A number one wood-type golf club head comprising a body made of wood. A sole plate is secured to the bottom surface of the wooden body, and at least one cavity is provided in the wooden body and having an opening at the bottom surface, to thereby allow the golf club head to be elongated; the body having a length between a front end and a rear end thereof, from the viewpoint of the swing of the golf club, of more than 83 millimeters. This provides for a greater moment of inertia to obtain a stable drive.
Inventors
- 👤 Masashi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:47
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0433; A63B60/00; A63B53/0408; A63B53/0416; A63B53/0458; A63B53/0462
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A number one wood-type golf club i.e., a driver, which comprises: a club head made of persimmon and having a bottom surface and a sole plate secured to said bottom surface; said club head having a front surface to which a front plate is secured to constitute a face for hitting a golf ball and a length between said front plate and a rear end thereof, from the viewpoint of the swing of the golf club, of more than 83 millimeters; said club head having at least one cavity therein opening at the bottom surface thereof to be covered by said sole plate, said at least one cavity having a blind end with a semispherical shape; and whereby said golf club has an increased moment of inertia and an increase in the possibility of obtaining a square hit with said golf club.
Claim 2
Dependent Claim
142 words
A number one wood-type golf club i.e., a driver, which comprises: a club head made of persimmon and having a bottom surface and a sole plate secured to said bottom surface; said club head having a front surface to which a front plate is secured to constitute a face for hitting a golf ball and a length between said front plate and a rear end thereof, from the viewpoint of the swing of the golf club, of more than 83 millimeters; said club head having at least one cavity therein opening at the bottom surface thereof to be covered by said sole plate, said at least one cavity having a blind end with a semispherical shape; and whereby said golf club has an increased moment of inertia and an increase in the possibility of obtaining a square hit with said golf club.
Claim 3
Dependent Claim
158 words
A number one wood-type golf club i.e., a driver, which comprises: a club head made of persimmon and having a bottom surface and a sole plate secured to said bottom surface; said club head having a front surface to which a front plate is secured to constitute a face for hitting a golf ball and a length between said front plate and a rear end thereof, from the viewpoint of the swing of the golf club, of more than 83 millimeters; said club head having at least one cavity therein opening at the bottom surface thereof to be covered by said sole plate; said at least one cavity comprising two cavities extending perpendicular to the bottom surface and in alignment with each other in a vertical plane perpendicular to said front surface; and whereby said golf club has an increased moment of inertia and an increase in the possibility of obtaining a square hit with said golf club.
Claim 4
Dependent Claim
158 words
A number one wood-type golf club i.e., a driver, which comprises: a club head made of persimmon and having a bottom surface and a sole plate secured to said bottom surface; said club head having a front surface to which a front plate is secured to constitute a face for hitting a golf ball and a length between said front plate and a rear end thereof, from the viewpoint of the swing of the golf club, of more than 83 millimeters; said club head having at least one cavity therein opening at the bottom surface thereof to be covered by said sole plate; said at least one cavity comprising two cavities extending perpendicular to the bottom surface and in alignment with each other in a vertical plane perpendicular to said front surface; and whereby said golf club has an increased moment of inertia and an increase in the possibility of obtaining a square hit with said golf club.
Claim 5
Dependent Claim
182 words
A number one wood-type golf club, i.e., a driver, which comprises: a club head made of persimmon and having a bottom surface and a sole plate secured to said bottom surface; said club head having a front surface to which a front plate is secured to constitute a face for hitting a golf ball and a length between said front plate and a rear end thereof, from the viewpoint of the swing of the golf club, of more 83 millimeters; said club head having at least one cavity therein opening at the bottom surface thereof to be covered by said sole plate; said at least one cavity comprising two cavities extending perpendicular to the bottom surface and in alignment with each other in a vertical plane perpendicular to said front surface; wherein said two cavities are located in such a manner that the center of gravity of said golf club head lies between said two cavities; and whereby said golf club has an increased moment of inertia and an increase in the possibility of obtaining a square hit with said golf club.
Claim 6
Dependent Claim
182 words
A number one wood-type golf club, i.e., a driver, which comprises: a club head made of persimmon and having a bottom surface and a sole plate secured to said bottom surface; said club head having a front surface to which a front plate is secured to constitute a face for hitting a golf ball and a length between said front plate and a rear end thereof, from the viewpoint of the swing of the golf club, of more 83 millimeters; said club head having at least one cavity therein opening at the bottom surface thereof to be covered by said sole plate; said at least one cavity comprising two cavities extending perpendicular to the bottom surface and in alignment with each other in a vertical plane perpendicular to said front surface; wherein said two cavities are located in such a manner that the center of gravity of said golf club head lies between said two cavities; and whereby said golf club has an increased moment of inertia and an increase in the possibility of obtaining a square hit with said golf club.
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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) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |