US4213608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Game racquets
Assignee: Individual
•
Filing: 1978-09-15
•
Granted: 1980-07-22
•
Expires: 1998-09-15
Abstract
Abstract A radical new game racquet consisting of a frame and ball contacting facing surfaces which can move with respect to the frame. The facing is capable of having a nonnegligible velocity in a plane tangent to the facing at a given point. The facing motion is used to produce extra spin on the ball. The facing motion can be produced by a variety of means, which are further described in the text.
Inventors
- 👤 Mithra S. Krishnan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:39
CPC Classifications
A; A63; A63B; A63B51/00; A63B51/06; A63B51/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A game racquet-containing in combination: a substantially rigid frame in the form of a handle and a head; two rotatable spools mounted on members by means of bearings on opposite sides of said head, said spools having approximately parallel axes of rotation; a ball-contacting facing containing closed loops of strings held in tension around the aforementioned spools; wherein forces applied to said facing between said spools in a non-perpendicular direction with respect to said facing, or torques applied directly to said spools to cause them to rotate will provide movement of said facing around said members thus imparting a spin to a ball that contacts said facing during said rotation.
Claim 2
Dependent Claim
110 words
A game racquet-containing in combination: a substantially rigid frame in the form of a handle and a head; two rotatable spools mounted on members by means of bearings on opposite sides of said head, said spools having approximately parallel axes of rotation; a ball-contacting facing containing closed loops of strings held in tension around the aforementioned spools; wherein forces applied to said facing between said spools in a non-perpendicular direction with respect to said facing, or torques applied directly to said spools to cause them to rotate will provide movement of said facing around said members thus imparting a spin to a ball that contacts said facing during said rotation.
Claim 3
Dependent Claim
36 words
The racquet of claim 1, wherein the spool tips, are of reduced radius as compared to the spool body. The spool-parallel facing tension is thus substantially maintained by a corresponding compression force in the spools themselves.
Claim 4
Dependent Claim
20 words
The racquet of claim 1, wherein operative means are furnished for the player to cause said motion of said facing.
Claim 5
Dependent Claim
22 words
The racquet of claim 1, wherein said motion of said facing is powered to some extent by energy from the game player.
Claim 6
Dependent Claim
30 words
The racquet of claim 1, wherein said motion of said facing is powered to some extent by a control mechanism attached to the handle and operatively connected to the facing.
Claim 7
Dependent Claim
28 words
The racquet of claim 1, wherein said motion of said facing is powered to some extent by the contact of some portion of the racquet along some surface.
Claim 8
Dependent Claim
24 words
The racquet of claim 1, wherein said motion of said facing is powered to some extent by a motor operatively connected to said facing.
References Cited (Backward Citations)
US2670958A
Cited
US3734499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |