Games using tangible projectile – Player held and powered – nonmechanical projector – per se,... – Racket or paddle; accessory therefor
Reexamination Certificate
2011-05-10
2011-05-10
Chiu, Raleigh W. (Department: 3711)
Games using tangible projectile
Player held and powered, nonmechanical projector, per se,...
Racket or paddle; accessory therefor
C473S521000, C473S548000
Reexamination Certificate
active
07938747
ABSTRACT:
The present invention is intended for use as a game racket including a handle and a head frame with strings held in tension. In particular as a high performance game racket frame including at least one generally tubular, substantially circular pivot element located at least partially within a substantially circular mating recess on at least one portion of an outside-facing peripheral surface of the head frame profile that can rotate to cooperate with at least one string. The pivot element can rest upon at least a portion of the mating recess and therefore can have at least one adjoining surface portion. In order to reduce friction, adjoining surface(s) can be coated with a suitable anti-friction agent such as silicone or it can include a “frictionless” repelling permanent magnet portion capable of sustaining magnetic levitation between the two parts. Alternatively, at least a portion of the adjoining surfaces can include communicating electromagnetic friction plates in order to control the rate at which the pivot element rotates.
REFERENCES:
patent: 360468 (1887-04-01), Phelps
patent: 4786055 (1988-11-01), Darling
patent: 5054779 (1991-10-01), Marrello
patent: RE34420 (1993-10-01), Darling
patent: 5251895 (1993-10-01), Darling
patent: 6503161 (2003-01-01), Bothwell
patent: 6971964 (2005-12-01), Bothwell
patent: 2009/0215558 (2009-08-01), Bothwell
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