Patent US1728289A successfully refreshed from Google Patents.
Patent US4693474A successfully refreshed from Google Patents.
US4693474A
Expired / Lapsed
US
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Games racket
Assignee: Dunlop Ltd
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Filing: 1985-06-24
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Granted: 1987-09-15
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Expires: 2005-06-24
Abstract
Abstract The invention relates to a games racket having a strung head and additional structure for adjusting the playing properties of the racket. Removable weights are attached to the circumference of the head by way of carrier members which are secured to the head in the region of the transverse axis through the center of percussion of the racket. The carrier members have recesses into which the weights can be inserted.
Inventors
- 👤 Herbert Glaessgen
- 👤 Wolfgang Kleinheinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:10
CPC Classifications
A; A63; A63B; A63B60/00; A63B60/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
In a games racket having adjustable playing properties, said racket having a frame comprising a head for stringing and a handle; said frame having at least one weight removably attached thereto at least one position on the circumference thereof, the improvement which comprises at least one carrier member secured to said head at a position corresponding to the transverse axis extending through the center of percussion of said racket, each said carrier member having recesses to receive said weights; said frame including string-protecting grommets some of which are extended in length, said extended grommets having circumferential recesses to receive said carrier members.
Claim 2
Dependent Claim
102 words
In a games racket having adjustable playing properties, said racket having a frame comprising a head for stringing and a handle; said frame having at least one weight removably attached thereto at least one position on the circumference thereof, the improvement which comprises at least one carrier member secured to said head at a position corresponding to the transverse axis extending through the center of percussion of said racket, each said carrier member having recesses to receive said weights; said frame including string-protecting grommets some of which are extended in length, said extended grommets having circumferential recesses to receive said carrier members.
Claim 3
Dependent Claim
25 words
The games racket of claim 1, wherein each said carrier member is claw-shaped and attachable on to the inner or outer circumference of said frame.
Claim 4
Dependent Claim
57 words
The games racket of claim 1, wherein said weights consist of balls of a material of high specific gravity and the recesses in said carrier members are of hollow ball-shaped and correspond to the diameter of the balls, whereby more than half of the surface of one of said balls can be enclosed in each said recess.
Claim 5
Dependent Claim
37 words
The games racket of claim 3, wherein said hollow ball-shaped recesses in said carrier members are so arranged that the plane of their openings extends approximately at right angles to the stringing plane of said racket head.
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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) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |