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 |
| 7238296 | Resistive composition, resistor using the same, and making method thereof When the entire amount of conductive metal mixed powder made of copper, manganese, and germanium is 100 parts by weight, the metal mixed powder is formed by mixing 4.0 to 13.0 parts manganese by weight, 0.2 to 1.4 parts germanium by weight, and 85.6 to 95.8 parts co... | 07/03/2007 |
| 7193498 | Method of producing temperature sensor and mounting same to a circuit board Temperature sensors are produced by first producing temperature sensing elements each having electrodes on its mutually oppositely facing main surfaces, next forming a lead frame comprising a linearly elongated base part and a plurality of pairs of planar lead parts... | 03/20/2007 |
| 6917278 | Resistor banks A Resistor bank has first and second supporting member. Held on to the supporting members is a resistor element comprising a strip of resistor material which is bent into a zigzag shape. The strip is continuous and has a non-planar cross section profile. A plurality... | 07/12/2005 |
| 6700098 | System for preventing and clearing ice dams A system for preventing and clearing gutter ice dams includes a plurality of wire holding assemblies, each assembly having a base for attachment to a gutter and a length-adjustable arm for contact with a roof adjacent the gutter. The arm is rotatably and ... | 03/02/2004 |
| 6690258 | Surface-mount positive coefficient thermistor and method for making the same A surface-mount positive coefficient thermistor includes a plate-like positive coefficient thermistor element, a pair of electrodes on the respective two main surfaces of the positive coefficient thermistor element, a pair of metal terminals each having a... | 02/10/2004 |
| 6570484 | Mounting structure for thermistor with positive resistance-to-temperature characteristic A thermistor with positive resistance-to-temperature characteristic used in a overcurrent protection circuit has electrodes on mutually opposite main surfaces and is mounted to a substrate having electrically conductive members such that deterioration of ... | 05/27/2003 |
| 6489880 | Mounting structure for thermistor with positive resistance-to-temperature characteristic A thermistor with positive resistance-to-temperature characteristic used in a overcurrent protection circuit has electrodes on mutually opposite main surfaces and is mounted to a substrate having electrically conductive members such that deterioration of ... | 12/03/2002 |
| 6366194 | Component holder for a hall sensor and process for manufacturing a component holder Known Hall sensors are fastened to a printed circuit board by way of component holders in order to achieve an exact positioning and securing on a printed circuit board in relation to a magnet ring of a rotor of an adjusting motor. A component holder for a... | 04/02/2002 |
| 6154118 | Circuit protective device with positive temperature coefficient element and electric junction box with the device A circuit protective device with a positive temperature coefficient element is provided, which includes: a positive temperature coefficient (hereinafter "PTC") element, made of a conductive composition having a PTC characteristics, provided for shutting o... | 11/28/2000 |
| 6091317 | Temperature sensor assembly A temperature sensor assembly (10) including a pair of rigid lead frames (12, 14) having retention pockets (24, 26) thereon for retaining a sensor assembly (32). The sensor assembly (32) includes a surface mount device package (34) containing a thermistor... | 07/18/2000 |
| 6020577 | Electric heating element support structures and method of making same A structure is provided for supporting at least one heating element inside an electric heater housing. To produce the support structure, a web is cut out of a metal sheet that includes a rectangular member, one or more support brackets and a neck portion ... | 02/01/2000 |
| 6020809 | Mounting structure for thermistor with positive resistance-to-temperature characteristic A thermistor with positive resistance-to-temperature characteristic used in a overcurrent protection circuit has electrodes on mutually opposite main surfaces and is mounted to a substrate having electrically conductive members such that deterioration of ... | 02/01/2000 |
| 5929743 | Mounting structure for thermistor with positive resistance-to-temperature characteristic A thermistor with positive resistance-to-temperature characteristic used in a overcurrent protection circuit has electrodes on mutually opposite main surfaces and is mounted to a substrate having electrically conductive members such that deterioration of ... | 07/27/1999 |
| 5917404 | Power resistor An improved power resistor includes a resistive element extending between a first electrical connection terminal and a second electrical connection terminal. The resistive element has a plurality of first insulating regions, arranged along its length exte... | 06/29/1999 |
| 5877674 | Resistor with elongated resistor element panels A resistor comprising a substantially continuous resistor element being formed into a plurality of element panels with each panel having at least two holes provided therein. Adjacent element panels are connected in series by a bend in the resistor element... | 03/02/1999 |
| 5841341 | Clip for PTC devices A dielectric clip for holding a PTC device is dimensioned and shaped to occupy a three-dimensional space envelope that provides a close fit in a fuse socket.... | 11/24/1998 |
| 5835680 | Immersion heater and support structure An apparatus for heating water is provided having a water receptacle including a bottom wall and side walls for containing a volume of water therein to be heated. The bottom wall of the receptacle has an exterior surface and an interior surface proximate ... | 11/10/1998 |
| 5808279 | Heating panel for making ovens for thermoforming apparatus An improved construction panel, in particular for ovens to be used in heating stations of thermoforming apparatus, comprises two separated portions, that is: a front portion (2) provided with heating elements; and a rear portion (3) holding the related po... | 09/15/1998 |
| 5801361 | Ceramic igniter with hot zone thickness of 0.019 inches or less A ceramic igniter comprises a pair of conductive ends, a hot zone disposed between the conductive ends, the hot zone having a density of at least about 95% of theoretical density and a composition comprising: (a) between about 50 and about 80 vol % of an elect... | 09/01/1998 |
| 5335311 | Modular galvanic current control resistor assembly for mounting on an electric immersion heater A modular galvanic current control resistor assembly for application to a metallic sheathed heating element of a domestic water heating tank to prevent heating element corrosion includes a circular metallic disc adapted to fit over the sheath ends of a U-... | 08/02/1994 |
| 5324919 | Open coil heater for efficient transport with nestable heating elements An heater includes an electric heating coil that extends above the sidewalls of an air flow channel. The coil is formed in sections that extend transversely to the channel and are spaced by the width of a coil section to allow two heaters to be arranged f... | 06/28/1994 |
| 5281944 | Slide-in resistor grid A resistor grid for dynamic braking of diesel electric locomotives has a rigid frame that includes outer metal side pieces and metal dividers within the frame between which are positioned columns of fan-folded resistor ribbon. The dividers carry support p... | 01/25/1994 |
| 5229741 | Automotive resistor unit having mounting clip The resistor unit comprises resistors connected to electrical terminals secured to an insulating plate to which first and second legs of a spring sheet metal mounting clip are secured for insertion through an opening in a supporting wall. The legs are ben... | 07/20/1993 |
| 5175044 | Sheet-like ceramic substrate for tip parts A sheet-like ceramic substrate for tip parts is provided which can effectively prevent occurrence of a crack thereof. The ceramic substrate comprises a ceramic sheet 7 having first and second primary dividing grooves 2a and 2b and first and second seconda... | 12/29/1992 |
| 5140298 | Ceramic base component packaging assembly A ceramic base component packaging assembly with high thermal transfer rates. The packaging assembly includes a molded plastic cover that receives spring washers, ceramic pads, resistive elements or other electronic components, and a thermally conductive ... | 08/18/1992 |
| 5068637 | Plate-like metal element for electrical resistor grid assembly For use in a welded resistor grid assembly moving a plurality of generally parallel, relatively think plate-like metal elements disposed between a pair of spaced-apart insulating support members having a plurality of slotted openings in their opposing sid... | 11/26/1991 |
| 5034718 | Spark protection for high voltage resistors Resistors have successfully replaced corona point discharge devices in the control of high voltage gradients, such as those experienced in electrostatic accelerators. An improved resistor for such applications which has a single elongate resistive element... | 07/23/1991 |
| 5019893 | Single package, multiple, electrically isolated power semiconductor devices Single package, electrically isolated dual, triple, quad, etc., power semiconductor devices are provided without use of ceramic or other isolators between the semiconductor die and the die support. For example, isolated dual power transistors, each having... | 05/28/1991 |
| 4953061 | Holder for printed circuit board components A method and article for holding and stabilizing printed circuit board components on the board during soldering or other processing.... | 08/28/1990 |
| 4832817 | Simple inspection device for analyzer for ionic activity measurement A simple inspection device is constituted for inspection of an analyzer for measuring ionic activity by using an ionic activity measuring device provided with at least one ion selective electrode pair for generating an electrical potential corresponding t... | 05/23/1989 |
| 4831354 | Polymer type PTC assembly A PTC polymer assembly in which a sheet of PTC polymer is sandwiched between two electrodes, and electric terminations are mechanically and electrically connected to the electrodes, at least one of the terminations is a looped spring connected at one end ... | 05/16/1989 |
| 4829282 | High efficiency high heat output electrical heater assembly A high temperature electrical resistance heater in which an electrically resistive strip is supported so that the strip may freely expand and contract and substantially all of the strip may directly radiate to provide maximum heat transport therefrom. The... | 05/09/1989 |
| 4748437 | Connector for a picture tube A picture tube connecting device, including a common integral insulating housing, connector contacts in the common housing for electrically contacting a picture, and at least one potentiometer, including a focus adjusting potentiometer in the housing, ele... | 05/31/1988 |
| 4727350 | Surge absorber A surge absorber in which an electrically conductive thin film is vaporized on the surface of a ceramic circular cylinder, a micro.groove is trimmed using a laser beam to define a spiral locus on the surface, and a linear.groove is trimmed to intersect th... | 02/23/1988 |
| 4716275 | Evaporator coil heat exchanger assembly An evaporator coil heat exchanger assembly of a refrigeration system, such as a transport refrigeration system, which includes an electrical heating element for rapid defrosting of the evaporator coil with its attendant refrigerant carrying tubes and cool... | 12/29/1987 |
| 4712086 | Support frame for resistor elements in a heating furnace for glass sheets The invention relates to a support frame for a resistor element in a heating furnace for glass sheets, said flame providing a substantially continuously extending, elongated rest surface for a resistor element. The support frame elements consist of trough... | 12/08/1987 |
| 4671058 | Heating device A heating device of the present invention has a heating element of a substantially V-shape and is made of a ceramic material having electric conductivity. Electrode plates are respectively mounted at both ends of the heating element for energizing the hea... | 06/09/1987 |
| 4661794 | Mounting structure for resistors used for controlling the running of industrial vehicles A mounting structure for resistors used for controlling the running of industrial vehicles, is disclosed. The apparatus is so constructed that a control panel of an L-shaped, said control panel being mounted to an inner wall surface of a frame cover which... | 04/28/1987 |
| 4651125 | Resistor grid assembly with rib turbulence generators A grid assembly for converting electrical energy to heat and then dissipating same. A plurality of parallel grid members include outwardly extending legs received in holes provided on mutually facing surfaces on polyester glass insulator members. The grid... | 03/17/1987 |
| 4617547 | Heater assembly A heater assembly includes a housing which both channels air flowing around a heating element and provides support structure for the elements holding the heating element. In one embodiment, a lower U-shaped channel has recesses in opposed sidewalls to eng... | 10/14/1986 |