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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 |
| 5098206 | Shaft bearing assembly for a miniature electric motor A shaft bearing assembly, particularly for a miniature electric motor. In the case of the present shaft bearing assembly, an oil-impregnated dampening disc made of an absorbent material the capillary action of which is greater than that of the porous bear... | 03/24/1992 |
| 4903533 | Turbine flowmeter A turbine flowmeter comprises an impeller which has a rotary shaft rotatable together with the impeller and is provided within a flow passage through which a fluid to be measured flows, a pair of bearing members for axially supporting the rotary shaft, an... | 02/27/1990 |
| 4664330 | Drag washer Friction drag washers for the drag assemblies of fishing reels are provided. The washers are made of a phenolic fiber material which is impregnated under vacuum with oil or an oil and STP oil additive solution. The viscosity of the oil can be changed to a... | 05/12/1987 |
| 4480849 | Wheel plate A wheel plate of a coupler for coupling a tractor and a trailer. The wheel plate has a lubricating arrangement for lubricating the sliding surfaces in the coupling. The lubricating arrangement includes a main groove formed in a central portion of the slid... | 11/06/1984 |
