Patent US737293A successfully refreshed from Google Patents.
US4792139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Golf club head
Assignee: Yamaha Corp
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Filing: 1986-08-15
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Granted: 1988-12-20
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Expires: 2006-08-15
Abstract
Abstract An improved golf club head includes a metallic main body 1 having a face side section 2 providing a face side surface for shooting balls. A rearwardly opening gouge 3 is formed within the main body, extending to an end wall 3a provided by the face side section. An FRP plate 4 is inserted into the gouge and held against the end wall 3a by an open frame 5 which engages a circumferential portion of the plate 4. Presence of the light FRP plate in the face side region allows free weight assignment to other regions for ideal inertia moment adjustment and produces locally laminated face side construction in which thickness ratio of components can be adjusted for better feel at shooting.
Inventors
- 👤 Yoichi Nagasaki
- 👤 Itsushi Nagamoto
- 👤 Toyohiko Tadokoro
- 👤 Masaki Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:31
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0466; A63B53/047; A63B60/00; A63B2209/00; A63B2209/02; A63B53/0416; A63B53/042; A63B53/0425; A63B53/0433
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
An improved golf club head comprising: a main body constructed of metal and having a face side section providing a planar face side surface for striking golf balls, said main body having a rear opening extending therein towards said face side surface to an end wall provided by a rear side surface of said face side section, a planar fiber reinforced plastic plate of substantially uniform thickness fixed to said end wall parallel to said face side surface, and means within said opening in the form of an open frame for engaging said fiber reinforced plastic plate about a circumferential portion thereof and holding same against said face side surface.
Claim 2
Dependent Claim
110 words
An improved golf club head comprising: a main body constructed of metal and having a face side section providing a planar face side surface for striking golf balls, said main body having a rear opening extending therein towards said face side surface to an end wall provided by a rear side surface of said face side section, a planar fiber reinforced plastic plate of substantially uniform thickness fixed to said end wall parallel to said face side surface, and means within said opening in the form of an open frame for engaging said fiber reinforced plastic plate about a circumferential portion thereof and holding same against said face side surface.
Claim 3
Dependent Claim
31 words
An improved golf club head as claimed in claim 1 in which said face said face side section has a substantially uniform thickness in a range from 0.5 to 3.0 mm.
Claim 4
Dependent Claim
32 words
An improved golf club head as claimed in claim 1 in which said open frame is made of a material taken from the group consisting of brass, lead alloy and stainless steal.
Claim 5
Dependent Claim
31 words
An improved golf club head as claimed in claim 10 in which said main body is made of a material taken from the group consisting of stainless steel and carbon steel.
Claim 6
Dependent Claim
34 words
An improved golf club head as claimed in claim 2, 10, 11 or 12 in which said fiber reinforced plastic plate has a substantially uniform thickness in a range from 1.0 to 5.0 mm.
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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) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |