US4984792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weighted tennis/racquetball racket
Assignee: Individual
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Filing: 1987-06-11
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Granted: 1991-01-15
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Expires: 2007-06-11
Abstract
Abstract An improvement in the rackets used in tennis and racquetball a round conduit in the frame or head of the racket, which is divided into two chambers by valve elements. A lower chamber containing mercury or other liquid communicates, through the valve elements, to an upper chamber. In use, the liquid is directed, by gravity and centrifugal force, between the two chambers to increase the amount of kinetic energy exerted against a ball, providing for a more powerful swing and improved tennis or racquetball game.
Inventors
- 👤 Jan Pacanski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:28
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B60/00; A63B60/02; A63B60/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
173 words
In a weighted racket for tennis or racketball provided with a frame having a base joined to a handle and including a net spanning an open area defined by the frame, the improvement comprising; an endless continuous conduit disposed fully within said frame and frame base and encircling said open area, fluid restricting means within said conduit symmetrically disposed relative to a longitudinal axis extending through said handle and adapted to regulate the flow of liquid from one side of said fluid restricting means to the other side, said fluid restricting means comprising a pair of spaced apart valve elements each having a reduced diameter bore disposed within said conduit and defining upper and lower chambers within said conduit respectively within said frame and base with said upper and lower chambers on opposite sides of said valve elements, and a liquid partially filling said conduit whereby, swinging of said racket produces a restricted displacement of said liquid between said chambers in said base and frame as said liquid passes through said valve elements.
Claim 2
Dependent Claim
173 words
In a weighted racket for tennis or racketball provided with a frame having a base joined to a handle and including a net spanning an open area defined by the frame, the improvement comprising; an endless continuous conduit disposed fully within said frame and frame base and encircling said open area, fluid restricting means within said conduit symmetrically disposed relative to a longitudinal axis extending through said handle and adapted to regulate the flow of liquid from one side of said fluid restricting means to the other side, said fluid restricting means comprising a pair of spaced apart valve elements each having a reduced diameter bore disposed within said conduit and defining upper and lower chambers within said conduit respectively within said frame and base with said upper and lower chambers on opposite sides of said valve elements, and a liquid partially filling said conduit whereby, swinging of said racket produces a restricted displacement of said liquid between said chambers in said base and frame as said liquid passes through said valve elements.
Claim 3
Dependent Claim
11 words
A racket according to claim 1 wherein, said liquid is mercury.
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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |