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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 |
| 4294501 | Plug member for the electrical connection of an appliance to a base A plug member for the electrical connection of an appliance to a base. The plug member comprises conducting pins, an insulating centering stud and means for locking the plug member on the base. The centering stud is open laterally. The locking means are d... | 10/13/1981 |
| 4192198 | Two gear train reduction mechanism This invention relates to a reduction mechanism including two gear trains, of different speed reductions, for rotating one cam, both gear trains having different input gears but a same output gear, said input gears being rotatable by a step-up gear mounte... | 03/11/1980 |
| 4186550 | Programmer for electric household appliances Programmer for electric household appliances, comprising an assembly of programming cams driven in rotation by a reversing cam driven itself by a motor, a timing wheel driven in rotation by the reversing cam via a set of levers, a first cam of the cam ass... | 02/05/1980 |