Tennis ball having an electrically conducting surface |
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| 申请号 | US23089772 | 申请日 | 1972-03-01 | 公开(公告)号 | US3854719A | 公开(公告)日 | 1974-12-17 |
| 申请人 | SUPRAN L; | 发明人 | SUPRAN L; | ||||
| 摘要 | A ball for playing games such as tennis, having an outer surface which is electrically conducting so that it can short-circuit or bridge wires laid on the surface of the court in order to enable a decision to be given as to whether the ball is ''''in'''' or ''''out'''' when it strikes the court on or near the lines defining the area of play. | ||||||
| 权利要求 | 1. A tennis ball comprising: flexible material in the form of a hollow sphere; a surface consisting of two panels of cloth stuck to the flexible material so as to cover the entire outer surface of the material of the hollow sphere; and staple sliver steel uniformly woven into the cloth to form an electrically conducting surface to the tennis ball. |
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