EP 0317711 A3 19900516 - RACKET FOR PLAYING A GAME WITH A BALL
Title (en)
RACKET FOR PLAYING A GAME WITH A BALL
Publication
Application
Priority
US 7999187 A 19870804
Abstract (en)
[origin: EP0317711A2] The stiffness of a tennis racket is adjusted so that the first mode of bending of the racket under free-free constraint conditions is between 170 Hz and 250 Hz preferably between 200 Hz and 210 Hz. The second mode of bending under clamped-free constraint conditions is between 215 Hz and 315 Hz and preferably between 230 Hz and 265 Hz.
IPC 1-7
IPC 8 full level
A63B 49/00 (2006.01); A63B 49/02 (2006.01); A63B 49/10 (2006.01); A63B 59/00 (2006.01)
CPC (source: EP KR US)
A63B 49/00 (2013.01 - KR); A63B 49/02 (2013.01 - EP US); A63B 49/10 (2013.01 - US); A63B 60/002 (2020.08 - EP); A63B 49/022 (2015.10 - EP); A63B 49/03 (2015.10 - EP); A63B 60/002 (2020.08 - US); A63B 60/48 (2015.10 - EP); A63B 2049/0203 (2015.10 - EP US); A63B 2049/0204 (2015.10 - EP US); A63B 2049/0207 (2015.10 - EP US); A63B 2049/0211 (2013.01 - EP US)
Citation (search report)
- [X] EP 0168041 A2 19860115 - SUMITOMO RUBBER IND [JP]
- [A] EP 0176021 A2 19860402 - KUEBLER SIEGFRIED
- [A] US 4291574 A 19810929 - FROLOW JACK L
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0317711 A2 19890531; EP 0317711 A3 19900516; EP 0317711 B1 19921209; AR 245599 A1 19940228; AT E83163 T1 19921215; AU 608254 B2 19910328; AU 8012587 A 19890209; BR 8704476 A 19880217; CA 1318696 C 19930601; CN 87213828 U 19880824; DE 3826545 A1 19890330; DE 3876605 D1 19930121; DE 3876605 T2 19930519; DK 169163 B1 19940905; DK 510887 A 19890205; DK 510887 D0 19870928; ES 2008281 A6 19890716; ES 2037158 T3 19930616; FI 874269 A0 19870929; FI 874269 A 19890205; FI 89334 B 19930615; FI 89334 C 19930927; GB 2208356 A 19890330; GB 2208356 B 19910807; GB 8720149 D0 19870930; GR 3007278 T3 19930730; IN 170468 B 19920328; JP 2507397 Y2 19960814; JP H0591726 U 19931214; JP S6437967 A 19890208; KR 890003419 A 19890414; KR 910009207 B1 19911105; MX 169436 B 19930705; NO 173686 B 19931011; NO 173686 C 19940119; NO 874084 D0 19870929; NO 874084 L 19890206; NZ 222358 A 19890927; ZA 878042 B 19880727
DOCDB simple family (application)
EP 88112740 A 19880804; AR 30911687 A 19871026; AT 88112740 T 19880804; AU 8012587 A 19871026; BR 8704476 A 19870831; CA 547074 A 19870916; CN 87213828 U 19870929; DE 3826545 A 19880804; DE 3876605 T 19880804; DK 510887 A 19870928; ES 8703007 A 19871021; ES 88112740 T 19880804; FI 874269 A 19870929; GB 8720149 A 19870826; GR 930400500 T 19930309; IN 757DE1987 A 19870826; JP 21321087 A 19870828; JP 2232293 U 19930427; KR 870010039 A 19870910; MX 913987 A 19871104; NO 874084 A 19870929; NZ 22235887 A 19871029; ZA 878042 A 19871027