Patent US4993710A successfully refreshed from Google Patents.
US4993710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skewed bubble tube for golf club lie indicator
Assignee: MARSHALL PRODUCTS Inc
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Filing: 1980-06-14
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Granted: 1991-02-19
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Expires: 2000-06-14
Abstract
Abstract A lie indicator for a golf clubhead that has utility as a golf practice aid. The indicator includes a straight bubble tube mounted in slightly skewed relation to a base member so that the axis of the tube and the axis of the base member are skewed at about one degree with respect to one another. The base member includes a flush mounted magnet that releasably secures the indicator to the face of the clubhead. The base member is aligned with a score line on the face of the clubhead so that when the golfer centers the bubble in the tube, an apparent one degree over compensation is provided. However, the lie angle of the clubhead is correct at the moment of ball impact because the mass of the clubhead causes it to rotate during the swing by about one degree.
Inventors
- 👤 Perry C. Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:17
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/36; A63B69/3623; A63B69/3632; A63B53/00; A63B53/04; A63B53/047; A63B53/0441
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
124 words
A lie indicator for a golf clubhead, comprising: a linear-in-configuration bubble tube; said bubble tube having a first longitudinal axis of symmetry; a linear-in-configuration base member for holding said bubble tube; attachment means for releasably securing said base member to a clubhead face; said base member having a second longitudinal axis of symmetry; and said first and second longitudinal axes of symmetry being disposed at a predetermined angle with respect to one another so that the bubble in said tube may be centered with the lie of the club being incorrect at the golf ball address position but becomes correct at the moment of ball impact due to the downward displacement of the toe of the head as the club head impacts the ball.
Claim 2
Dependent Claim
124 words
A lie indicator for a golf clubhead, comprising: a linear-in-configuration bubble tube; said bubble tube having a first longitudinal axis of symmetry; a linear-in-configuration base member for holding said bubble tube; attachment means for releasably securing said base member to a clubhead face; said base member having a second longitudinal axis of symmetry; and said first and second longitudinal axes of symmetry being disposed at a predetermined angle with respect to one another so that the bubble in said tube may be centered with the lie of the club being incorrect at the golf ball address position but becomes correct at the moment of ball impact due to the downward displacement of the toe of the head as the club head impacts the ball.
Claim 3
Dependent Claim
14 words
The lie indicator of claim 1, wherein said predetermined angle is about one degree.
Claim 4
Dependent Claim
14 words
The lie indicator of claim 2, wherein said attachment means is a permanent magnet.
Claim 5
Dependent Claim
32 words
The lie indicator of claim 3, further comprising alignment means for aligning said second longitudinal axis of symmetry of said base means in parallelism with score lines formed on said clubhead face.
Claim 6
Dependent Claim
61 words
The lie indicator of claim 4, wherein said base member includes four side walls, wherein lowermost edges of said side walls collectively define a rectangular configuration, and wherein said alignment means includes a preselected edge of said side walls, whereby said preselected edge is placed into parallelism with a preselected score line on a clubhead face to align said lie indicator.
Claim 7
Dependent Claim
26 words
The lie indicator of claim 5, further comprising an attachment indicating means for indicating a correct positioning of the lie indicator relative to said clubhead face.
Claim 8
Dependent Claim
20 words
The lie indicator of claim 6, wherein said attachment indicating means includes a pointer formed integrally with said lie indicator.
Claim 9
Dependent Claim
144 words
A lie indicator adapted to be releasably attached to the face of a golf clubhead, comprising: a straight bubble tube that is partially liquid-filled and that has an air bubble therein; said bubble tube having a first longitudinal axis of symmetry; a straight base member for holding said bubble tube; said base member having a second longitudinal axis of symmetry; said first and second longitudinal axes of symmetry being disposed oblique to one another at about a one degree angle so that the bubble in said tube may be centered with the lie of the club being incorrect at the golf ball address position but becomes correct at the moment of ball impact due to the downward displacement of the toe of the head as the club head impacts the ball; and attachment means for releasably securing said base member to said clubhead face.
Claim 10
Dependent Claim
144 words
A lie indicator adapted to be releasably attached to the face of a golf clubhead, comprising: a straight bubble tube that is partially liquid-filled and that has an air bubble therein; said bubble tube having a first longitudinal axis of symmetry; a straight base member for holding said bubble tube; said base member having a second longitudinal axis of symmetry; said first and second longitudinal axes of symmetry being disposed oblique to one another at about a one degree angle so that the bubble in said tube may be centered with the lie of the club being incorrect at the golf ball address position but becomes correct at the moment of ball impact due to the downward displacement of the toe of the head as the club head impacts the ball; and attachment means for releasably securing said base member to said clubhead face.
Claim 11
Dependent Claim
58 words
The lie indicator of claim 8, wherein said base member includes four side walls that collectively form a hollow cavity therebetween, wherein a permanent magnet is permanently positioned within said cavity, wherein an operative face of said permanent magnet is flat and positioned flush with lowermost edges of said side walls, said permanent magnet being said attachment means.
Claim 12
Dependent Claim
26 words
The lie indicator of claim 9, further comprising an attachment indicating means in the form of a pointer that is integrally formed with said base member.
Claim 13
Dependent Claim
47 words
The lie indicator of claim 10, further comprising alignment means for aligning said lie indicator and said clubhead face, said alignment means being a lowermost edge of a preselected side wall, said lowermost edge being disposed in parallelism with a score line formed on said clubhead face.
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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |