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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 |
| 4975677 | Guided variable resistor A variable resistor including a resistive element and a conductive element supported by a plate. Contacting terminals are provided on one or more ends of each element. A carriage is slidably supported above the elements and a conductive roller is supporte... | 12/04/1990 |
| 4878040 | Variable resistor A variable resistor includes strip-shaped conductive and resistive elements on an insulator plate. A cylindrical-shaped, conductive roller element can be rolled over the conductive and resistive elements to vary resistance. Thereby, substantially all slid... | 10/31/1989 |
| 4333068 | Position transducer A sealed position transducer which is self-wiping and which is readily adaptable for providing both linear and nonlinear electrical outputs. The transducer includes a housing, a resistive element received in the housing, and a flexible membrane, having a ... | 06/01/1982 |
| 4173005 | Position indicator A position indicator of potentiometer type includes two parallel wires, each having first and second ends, and a movable, rotatable contact cylinder around which the wires pass round at least one turn. The potential contact is made via the first end of a ... | 10/30/1979 |
| 3940042 | Speed control device A device for equalizing the speeds at which material moves through different sections of a machine which includes a tiltable structure sensitive to the depth of sag of the material passing from one section to another, a coil having a straight longitudinal... | 02/24/1976 |
