Patent US4330125A successfully refreshed from Google Patents.
US4330125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reducing torque and vibration in racquets
Assignee: Individual
•
Filing: 1980-08-22
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Granted: 1982-05-18
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Expires: 2000-08-22
Abstract
Abstract A device for reducing torque and vibration caused by an off-center impact between a ball and the face of a racquet. The device includes tubular guide means located about the periphery of the racquet head. Mounted within the tubular guide means are a system of self-adjusting counterbalancing weights. Movement of the racquet by an off-center impact causes the counterbalancing weights to be displaced. The displacement of the weights offsets and balances the torque and vibration of the impact.
Inventors
- 👤 Marvin L. Sassler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:58
CPC Classifications
A; A63; A63B; A63B49/00; A63B51/00; A63B51/02; A63B60/00; A63B60/02; A63B60/04; A63B60/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A racquet comprising a head portion having a striking surface and a shaft portion having one end connected to said head portion and having a handle at the other end portion, said head portion including a continuous one-piece looped tubular guide means, said guide means being free from internal obstructions; weight means disposed within said guide means so as to be displacable along said guide means, said weight means being of sufficient magnitude and being free to move along and unobstructively throughout said guide means so as to counterbalance the torque and vibration produced by off-center impacts upon said striking surface.
Claim 2
Dependent Claim
101 words
A racquet comprising a head portion having a striking surface and a shaft portion having one end connected to said head portion and having a handle at the other end portion, said head portion including a continuous one-piece looped tubular guide means, said guide means being free from internal obstructions; weight means disposed within said guide means so as to be displacable along said guide means, said weight means being of sufficient magnitude and being free to move along and unobstructively throughout said guide means so as to counterbalance the torque and vibration produced by off-center impacts upon said striking surface.
Claim 3
Dependent Claim
14 words
The device as claimed in claim 1, wherein said weight means comprises liquid means.
Claim 4
Dependent Claim
14 words
The device as claimed in claim 1, wherein said weight means comprise small spheres.
Claim 5
Dependent Claim
54 words
The device as claimed in claim 1, further including means for attaching said guide means to the periphery of said head portion, said means for attaching include an elongated filament wound around the outer periphery of said head portion of said racquet so that said guide means may be attached to an existing racquet.
Claim 6
Dependent Claim
37 words
The device as claimed in claim 1, further including means for attaching said guide means to the periphery of said head portion, said means for attaching include a groove integral with said head portion of said racquet.
Claim 7
Dependent Claim
17 words
The device as claimed in claim 1 wherein said guide means constitutes the entire racquet head portion.
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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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |