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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 |
| 7343873 | Step voltage regulator polymer position indicator with non-linear drive mechanism A position indicator may include a position indicator display and mechanism. A polymer housing houses the position indicator display and mechanism and a one-piece clear polymer cover encloses the position indicator display and mechanism in the polymer housing. The p... | 03/18/2008 |
| 7219468 | Automatic watering device for hanging baskets and planter boxes An apparatus for automatically watering a plant in a container by regulating a flow of water to the container through flexible tubing. Upper and lower jaw members are interconnected by a horizontal pivot axis so that they develop a scissors action. A jaw area is for... | 05/22/2007 |
| 6925959 | Indicating instrument The invention relates to an indicating instrument, particularly for a motor vehicle, comprising an approximately circular scale (12), which is placed on a dial (5), provided for a physical quantity, and along which a pointer (10) can be displace... | 08/09/2005 |
| 6234106 | Position indicator A position indicator for a motor drive for actuating a step switch, tap changer, or dipping coil, has a display board having front and back faces and a first circular array of symbols on the front face corresponding to individual switching phases traverse... | 05/22/2001 |
| 5303587 | Diver's depth gauge The present invention comprises an oil-filled depth gauge which is made far less sensitive to violent shock and the potential resulting inaccuracies to the maximum depth gauge indicator from such shock. More specifically, the present invention comprises a... | 04/19/1994 |
| 5067667 | Aircraft optimization indicia and the use thereof An aircraft flight dynamics indicator utilize an artificial horizon and a plurality of indicators to establish climb and descent indexes wherein safe flight may be maintained during ascent and descent by cuing aircraft attitude to a visibly perceptive cha... | 11/26/1991 |
| 4883128 | Guidance system for farm implements A guidance system for a tractor drawn farm implement for providing an indication to the operator of the tractor as to variance of the implement from a desired course includes a pair of horizontally extending feeler rods supported by a shaft and having fre... | 11/28/1989 |
| 4773270 | Pressure gage A pressure gage for indicating pressure and variations thereof of a physical variable being monitored. The gage is provided with a circular dial having on the face thereof a pheripheral marginal portion or border green in color and graduations disposed in... | 09/27/1988 |
| 4380963 | Movable limit markers for viewing glass of measuring instruments A viewing glass used through which measurements are displayed which comprises a groove (5) having a shape parallel to the movement of an indicator needle. Displaceable markers are placed in the groove in order to denote the limiting positions of the measu... | 04/26/1983 |
| 4249474 | Load-carrying slings A sling has an indicator device which automatically registers the maximum permissible load which can be carried in accordance with the instantaneous angle of inclination of the strands of the sling.... | 02/10/1981 |
| 4222390 | Sphygmomanometer gauge and method of use for blood pressure measurement A sphygmomanometer gauge included a stationary dial having graduations indicative of different blood pressure values. A needle is turnable about an axis over the dial in response to changes in air pressure generated in the sphygmomanometer. A pair of adju... | 09/16/1980 |
| 4195589 | Indicating device for torque wrenches The improved indicating device is constructed from a single piece of resilient material such as Delrin or Teflon and includes a bifurcated friction portion that is disposed in a groove in the wrench. The friction portion is constructed so that the tines c... | 04/01/1980 |
| 4081999 | Temperature indicator with limit detection apparatus A thermometer having temperature limit indication includes a support plate having a bimetal coil secured to the plate by a suitable hub. A pointer arm is extended from the bimetal coil and positioned across a temperature scale on the plate in accordance w... | 04/04/1978 |
| 3996880 | Field strength meter A signal strength meter indicates signal level directly in dBmV. The signal under test is attenuated to a level which centers a meter indicator, and the attenuator movement is translated into numerical direct reading information of signal level. Push butt... | 12/14/1976 |
| 3996881 | Rotary indicating instrument with magnetic reset A rotary hand indicating instrument including a maximum hand and having a solid crystal formed with stub shafts projecting axially from its front and rear faces, upon which shafts the maximum hand and associated magnetic resetting control elements are mou... | 12/14/1976 |
| 3967578 | Moisture gauge for a hanging potted plant A moisture gauge for a hanging potted plant, which comprises a generally U-shaped spring element comprising a spring coil and a pair of approximately parallel arms extending from said spring coil shaped to provide notches opposite one-another at spaced in... | 07/06/1976 |
