US4367878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Golf club head
Assignee: Topgolf Callaway Brands Corp
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Filing: 1981-04-20
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Granted: 1983-01-11
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Expires: 2001-04-20
Abstract
Abstract A golf club wood head has a front face with bulge curvature defined by the intersection of generally horizontal planes normal to the front face, those intersections defining curved lines which are generally parabolic. The front face also has curved lines in a vertical plane resulting in a compound curvature, and the front face intersects the uppermost frontal portion of the head along a generally straight line, when viewed downwardly from a position above the front face.
Inventors
- 👤 Glenn H. Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:25
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0408; A63B53/0466; A63B60/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
In a golf wood head having a heel, toe, top surface, bottom surface, a rear side and a front face to strike a ball, the improvement comprising (a) said front face having bulge curvature defined by the line intersections of parallel planes normal to said front face and inclined downwardly and rearwardly relative to the horizontal, at a shallow angle, (b) said intersections defining curved lines which are parabolas, when viewed from a position above the club head and spaced rearwardly of a line normal to said bottom surface, whereby the front face as defined is tilted rearwardly, (c) said front face also having roll curvature defined by intersections of forwardly extending vertical planes with said front face, said last named intersections defining curved lines which are forwardly convex, (d) the forwardmost parabolic curved line having a focus which is in direct rearward alignment with the center of said front face, (e) said front face having compound curvature as defined and intersecting the uppermost frontal portion of the head along a generally straight line when viewed downwardly from a position above said front face.
Claim 2
Dependent Claim
184 words
In a golf wood head having a heel, toe, top surface, bottom surface, a rear side and a front face to strike a ball, the improvement comprising (a) said front face having bulge curvature defined by the line intersections of parallel planes normal to said front face and inclined downwardly and rearwardly relative to the horizontal, at a shallow angle, (b) said intersections defining curved lines which are parabolas, when viewed from a position above the club head and spaced rearwardly of a line normal to said bottom surface, whereby the front face as defined is tilted rearwardly, (c) said front face also having roll curvature defined by intersections of forwardly extending vertical planes with said front face, said last named intersections defining curved lines which are forwardly convex, (d) the forwardmost parabolic curved line having a focus which is in direct rearward alignment with the center of said front face, (e) said front face having compound curvature as defined and intersecting the uppermost frontal portion of the head along a generally straight line when viewed downwardly from a position above said front face.
Claim 3
Dependent Claim
15 words
The improvement of claim 1 wherein said curved lines defined in sub-paragraph (c) are parabolic.
Claim 4
Dependent Claim
17 words
The combination of claim 1 wherein the head comprises a wood body and a metallic sole plate.
Claim 5
Dependent Claim
25 words
The combination of claim 1 wherein the head comprises a hollow metallic shell, and has an inert filler in the hollow defined by the shell.
Claim 6
Dependent Claim
24 words
The combination of claim 1 wherein the front to rear dimension of the head exceeds the top to bottom surface dimension of the head.
References Cited (Backward Citations)
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US2395837A
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US3172667A
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US3368812A
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US3625518A
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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) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |