Patent US5098103A successfully refreshed from Google Patents.
US5098103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixed compensating loft golf club head
Assignee: Individual
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Filing: 1991-05-28
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Granted: 1992-03-24
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Expires: 2011-05-28
Abstract
Abstract The striking face of any golf club, except a putter, is to incorporate a face loft angle that is fixed, but varies from the toe to the heel and is more lofted toward the heel than at the toe. The purpose is to mitigate the error in ball trajectory that is caused when the ball is struck some distance from the center of gravity of the club head face.
Inventors
- 👤 Robert F. MacKeil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:11
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0466; A63B60/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
66 words
An improved golf club head, wherein the improvement comprises a striking face, the loft angle of which varies from the toe to the heel of the club face, and being significantly less lofted at the toe than at the heel, the purpose being to maintain a more nearly constant loft angle when the golf ball is struck toward the heel or toe of the club face.
Claim 2
Dependent Claim
66 words
An improved golf club head, wherein the improvement comprises a striking face, the loft angle of which varies from the toe to the heel of the club face, and being significantly less lofted at the toe than at the heel, the purpose being to maintain a more nearly constant loft angle when the golf ball is struck toward the heel or toe of the club face.
Claim 3
Dependent Claim
58 words
A golf club head as defined in claim 1, wherein the improvement is incorporated into a club head normally described as a "wood" or "metalwood", and the loft angle of which varies a minimum of approximately 5° from the tow to the heel, but may vary more, and being less lofted at the toe than at the heel.
Claim 4
Dependent Claim
61 words
A golf club head as defined in claim 1, wherein the improvement is incorporated into a club head normally described as a "wood" or "metalwood", and the loft angle of which varies a minimum of approximately 3° from the toe to the center of the face, but may vary more, and being less lofted at the toe than at the center.
Claim 5
Dependent Claim
62 words
A golf club head as defined in claim 1, wherein the improvement is incorporated into a club head normally described as a "wood" or "metalwood", and the loft angle of which varies a minimum of approximately 3+ from the heel to the center of the club face, but may vary more, and being more lofted at the heel than at the center.
Claim 6
Dependent Claim
60 words
A golf club head as described in claim 1, wherein the improvement is incorporated into a club head normally described as an "iron", and the loft angle of which varies a minimum of approximately 3+ from the toe to the heel of the club face, but may vary more, and being less lofted at the toe than at the heel.
Claim 7
Dependent Claim
72 words
An addendum to a golf club head comprising: a face plate attachable to the striking face, said face plate having a loft angle which varies from the toe to the heel of the club face, and being significantly less lofted at the toe than at the heel, the purpose being to maintain a more constant loft angle when the golf ball is struck toward the heel or toe of the club face.
Claim 8
Dependent Claim
72 words
An addendum to a golf club head comprising: a face plate attachable to the striking face, said face plate having a loft angle which varies from the toe to the heel of the club face, and being significantly less lofted at the toe than at the heel, the purpose being to maintain a more constant loft angle when the golf ball is struck toward the heel or toe of the club face.
Claim 9
Dependent Claim
61 words
An addendum to a golf club head as defined in claim 6, wherein the club head is one normally described as a "wood" or "metalwood", and the loft angle of said addendum face plate varies a minimum of approximately 5° from the toe to the heel, but may vary more, and being less lofted at the toe than at the heel.
Claim 10
Dependent Claim
65 words
An addendum to a golf club head as defined in claim 6, wherein the golf club head is one normally described as a "wood" or "metalwood", and the loft angle of said addendum face plate varies a minimum of approximately 3° from the toe to the center of the face, but may vary more, and being less lofted at the toe than at the center.
Claim 11
Dependent Claim
65 words
An addendum to a golf club head as defined in claim 6, wherein the golf club is one normally described as a "wood" or "metalwood", and the loft angle of said addendum face plate varies a minimum of approximately 3° from the heel to the center of the club face, but may vary more, and being more lofted at the heel than at the center.
Claim 12
Dependent Claim
63 words
An addendum to a golf club head as defined in claim 6, wherein the golf club is one normally described as an "iron", and the loft angle of said addendum face plate varies a minimum of approximately 3° from the toe to the heel of the club face, but may vary more, and being less lofted at the toe than at the heel.
Claim 13
Independent Claim
71 words
A method of modifying the striking face of a golf club head, comprising; shaping the striking face so that the loft angle varies from the toe to the heel of the club face, and being significantly less lofted at the toe than at the heel, the purpose being to maintain a more nearly constant loft angle when the golf ball is struck toward the heel or toe of the club face.
Claim 14
Independent Claim
71 words
A method of modifying the striking face of a golf club head, comprising; shaping the striking face so that the loft angle varies from the toe to the heel of the club face, and being significantly less lofted at the toe than at the heel, the purpose being to maintain a more nearly constant loft angle when the golf ball is struck toward the heel or toe of the club face.
Claim 15
Dependent Claim
56 words
The method of claim 11, wherein the club head is one that is normally described as a "wood" or "metalwood", and the loft angle of said striking face is varies a minimum of approximately 5° from the toe to the heel, but may vary more, and being less lofted at the toe than at the heel.
Claim 16
Dependent Claim
59 words
The method of claim 11, wherein the club head is one that is normally described as a "wood" or "metalwood", and the loft angle of said striking face is varied a minimum of approximately 3+ from the toe to the center of the face, but may vary more, and being less lofted at the toe than at the center.
Claim 17
Dependent Claim
59 words
The method of claim 11, wherein the club head is one that is normally described as a "wood" or "metalwood", and the loft angle of said striking face is varied a minimum of approximately 3° from the heel to the center of club face, but may vary more, and being more lofted at the heel than at the center.
Claim 18
Dependent Claim
54 words
The method of claim 11, wherein the club head is one that is normally described as an "iron", and the striking face is varied a minimum of approximately 3° from the toe to the heel of the club face, but may vary more, and being less lofted at the toe than at the heel.
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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) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |