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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 6739989 | Weight holder attachable to athletic ball striker A weighting device for use on an athletic ball striker as during handle swinging of the striker comprising a receptacle having an opening via which the ball striking portion is received into the receptacle, with the handle projecting from the receptacle, a retainer ... | 05/25/2004 |
| 5135222 | Multi-mode playball A multi-mode playball whose components are a shaped casing of flexible material having an opening therein that is closable by a drawstring whose end portions, when the string is drawn, then extend from the closed opening, and a toy balloon, which in its u... | 08/04/1992 |
| 5071126 | Tennis racket cover and bag with measuring strap A tennis racket cover is provided with a measuring strap for measuring the height of a tennis net. A first end of the strap is attached to the cover, and a second end of the strap can be pulled away from the cover and positioned beyond a first end of the ... | 12/10/1991 |
| 4805748 | Sports duffle bag with height expansible racket pocket A sports duffle bag has a canvas, plastic, or leather, top opening tubular body, with a sidewall open top pocket closed by a slide fastener, and sized to snugly receive the head of a tennis racket. An opening at a top corner of the pocket permits the rack... | 02/21/1989 |
| 4778179 | Racket cover A cover for rackets, such as table tennis rackets having an impact portion and a handle portion, comprises a casing having two connected plate-shaped members forming an inner space therebetween for insertion of a racket. An opening is provided in the casi... | 10/18/1988 |
| 4090543 | Tennis racket cover A tennis racket cover having a pair of sheets sized and shaped to cover the opposite faces of tennis rackets. A third sheet covers and is secured at its periphery to the lower half of one of the pair of sheets to form a pocket designed to receive flat wal... | 05/23/1978 |
