Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7230211 | Electrical heating element An electric heating element is provided with a durable PTC resistance made at least partially of an iron-based alloy, exhibiting stable characteristics to a temperature of 1500 DEG C. and having a resistance/temperature characteristic curve which substantially incre... | 06/12/2007 |
| 7218201 | High pressure resistance body element A high-voltage resistor element which is superior to heat resistance, dielectric breakdown strength, vibration resistance and durability performance, and is advantageous to maintenance, inspection, adjustment, replacement and repair, is made up of: a cylindrical out... | 05/15/2007 |
| 6799367 | Manufacturing method for a spark plug A windbreak provided along a side of a tray prevents insulators located close to an entrance of a furnace from being directly cooled by the air coming into the furnace. All of the insulators mounted on the tray can be uniformly cooled when conveyed out of the furnac... | 10/05/2004 |
| 6172345 | High-voltage cartridge heater and method of manufacturing same A cartridge heater for high-voltage applications is disclosed. In one embodiment, the cartridge heater is substantially elongate and cylindrical, and comprises an outer stainless steel sheath having an outside diameter on the order of one-half inch or les... | 01/09/2001 |
| 6169276 | Electrical heating apparatus In an electrical heating apparatus having at least one heating body with a chemically substantially resistant sheathing surrounding same, the sheathing comprises at least two-layer co-extruded material. The material comprises an inner layer which in the p... | 01/02/2001 |
| 6121577 | Electrically heatable glow plug with oxygen getter material An electrically heatable glow plug for an internal combustion engine includes a corrosion-resistant metal jacket, a compressed powder filling contained therein, and an electrically conducting coil embedded in the filling. To increase the lifetime of the h... | 09/19/2000 |
| 6043459 | Electrically heatable glow plug with oxygen getter material An electrically heatable glow plug for an internal combustion engine includes a corrosion-resistant metal jacket, a compressed powder filling contained therein, and an electrically conducting coil embedded in the filling. To increase the lifetime of the h... | 03/28/2000 |
| 5977519 | Heating element with a diamond sealing material A substrate support plate including a heating element for use in a process chamber is described. The heating element includes an outer sheath, a heating filament and a thermally-conductive and electrically insulative sealing material. The sealing material... | 11/02/1999 |
| 5889460 | Electric resistance temperature sensor An electrical resistance temperature sensor (11) contained in a stainless steel, tubular jacket (12), which has a very small diameter of approximately 1 mm, a platinum resistance coil (18) running between two joining bolts (14, 19). The resistance coil wi... | 03/30/1999 |
| 5783801 | Seal for sealing and automatically cleaning a sheathed element of a heater plug for diesel engines A sheathed element for a heater plug for diesel engines includes a hollow metal sheath that is open at one end, has a closed opposite end, and defines a cavity. A heating element is positioned in the cavity and the cavity is filled with insulating powder.... | 07/21/1998 |
| 5575941 | Cartridge heater The cartridge heater disclosed has a coiled wire heater element with connected lead conductor wires contained within a metallic tubular sheath. Electrically insulative material insulates and supports the heater element and lead conductor wires within said... | 11/19/1996 |
| 5309133 | Temperature sensor In the manner of a tubular heater, a temperature sensor comprises a metallic tubular jacket with internal resistance wire coil embedded in insulating material and closing pieces having electrical connection members, so that a very simple, robust and high ... | 05/03/1994 |
| 5198641 | Sheathed heater A sheathed heater wherein before the sheathed heater is assembled, an oxide film is formed on the inner peripheral surface of a metal pipe, and/or the outer surfaces of an internal heater and lead pins thereof which are inserted into the metal pipe by hea... | 03/30/1993 |
| 5136143 | Coated cartridge heater An improved cartridge heater comprising a electrical resistance heating wire coil enclosed in a stainless steel cylindrical sheath and having bonded thereto a coating containing a solid lubricant and a binder. The solid lubricant providing for ease of rem... | 08/04/1992 |
| 5118921 | Metallic sheath heater with improved electrical connection between coil and sheath and method of manufacture thereof A sheath heater includes a metal sheath, a coil-like heater, and a heat-resistant insulating powder. The starting form of the metal sheath has a small-diameter cylindrical portion at its distal end and is formed to have a substantially tubular shape as a ... | 06/02/1992 |
| 5111002 | Method of fabricating thermocouple cable and the cable resulting therefrom An improvement in the method for preparing diffusion resistant clad thermocouple cable by placing the thermocouple wires in MgO powder or pellets on a strip of metal cladding material and longitudinally bending the strip of cladding material around the th... | 05/05/1992 |
| 5010316 | Thermocouples of enhanced stability There is described mineral-insulated metal-sheathed (MINS) cables in which the sheath alloy has the following compositions: ______________________________________ Element Concentration (wt. %) ______________________________________ Cr ... | 04/23/1991 |
| 4972067 | PTC heater assembly and a method of manufacturing the heater assembly A self-regulating PTC heater assembly and a method of manufacturing the heater assembly is disclosed. PTC heater assembly includes a plurality of positive temperature coefficient devices, a plurality of spacers located between the positive temperature coe... | 11/20/1990 |
| 4963717 | Glow plug for internal combustion engine A glow plug including a shell provided with an axially extending bore and a tubular sheath partially located in the bore and partially projecting from the shell. At least a first electrical resistance is located in the portion of the sheath extending outs... | 10/16/1990 |
| 4956544 | Overheat protected electric cartridge heater An electric cartridge heater for use as an immersion heater in a steam table tank has a tubular elongate stainless steel sheath with a curved inner surface attached to a riser tube adapted to be connected to a wall of the tank and contains an electric hea... | 09/11/1990 |
| 4950873 | Sheath heater A corrosion-resistant steel tube such as a sheath heater steel tube and boiler tube which exhibit improved resistance to dry corrosion under high temperature dry-corrosive conditions in the presence of chlorides is disclosed. The steel consists essentiall... | 08/21/1990 |
| 4789512 | Method of enclosing an object within a homogeneous block An object such as a fuse is enclosed within a homogeneous block of microporous thermal insulation material by a method which includes forming first and second blocks of insulation material having a relatively low density, arranging the object between co-o... | 12/06/1988 |
| 4770833 | Method of enclosing an object A method of enclosing an object, such as an electronic component, within a homogeneous block of microporous thermal insulation material comprises charging a first predetermined amount of a loose microporous thermal insulation mixture into a die and compac... | 09/13/1988 |
| 4742324 | Sheath heater A corrosion-resistant steel tube such as a sheath heater steel tube and boiler tube which exhibit improved resistance to dry corrosion under high temperature dry-corrosive conditions in the presence of chlorides is disclosed. The steel consists essentiall... | 05/03/1988 |
| 4725711 | Self temperature control type glow plug A self-regulating temperature controlled glow plug has a hollow metal holder, a rod-like ceramic heater and a power control heater. The ceramic heater extends from one end of the holder and has embedded therein a first resistor of tungsten alloyed with rh... | 02/16/1988 |
| 4704514 | Heating rate variant elongated electrical resistance heater An electrical resistance heater capable of generating heat at different rates at different locations along its length comprises a continuous and unitary electrical conductor having a thickness which is different at different locations along its length.... | 11/03/1987 |
| 4701599 | Insulation system of sheathed heating elements An improved copper sheathed heating element for installation in appliances, such as electric kettles, includes a minor amount of a silicone water-proofing agent admixed with magnesium oxide filler agent prior to the element being annealed. Annealing of th... | 10/20/1987 |
| 4689443 | Armored cable having mineral insulation An armored cable having mineral insulation, comprising a metal central conductor and a cylindrical hollow metal sheath between which a powdered refractory insulating material is interposed, characterized in that the mineral insulating material is a mixtur... | 08/25/1987 |
| 4639712 | Sheathed heater A sheathed heater comprising a metallic sheath, such as a stainless steel sheath, an electric heating element disposed within the sheath so that an electric current can be supplied thereto, and a filling material filled in the sheath for insulating the he... | 01/27/1987 |
| 4626665 | Metal oversheathed electrical resistance heater A corrosion-resistant long heater is formed by encasing segments of metal-sheathed, mineral-insulated, electrical resistance heating elements within a metal oversheath which oversheath is substantially completely impermeable and is compressed inwardly to ... | 12/02/1986 |
| 4586020 | Sheathed resistance heater This invention relates to a sheathed resistance heater which comprises a metal pipe (3), a heating wire (2) received in the metal pipe, and an electrically insulating powder (4) filled in the pipe and also to a method for fabricating same. The electricall... | 04/29/1986 |
| 4540972 | Heat sensitive cable A heat sensitive cable operable over a temperature range of between approximately -20° F. and 1650° F. The cable includes a tubular metallic sheath which is substantially temperature resistant and moisture impervious. It also includes a mass of compacte... | 09/10/1985 |
| 4512827 | Method of manufacturing mineral insulated electric cable and like elements In a mineral insulated electric cable the powdered insulating material is impregnated with a quantity of a hydrophobic material, for example a silicone, which has been introduced into the powder in liquid form. The added hydrophobic material serves as a b... | 04/23/1985 |
| 4506251 | Sheathed resistance heater This invention relates to a sheathed resistance heater which comprises a heating wire (2) received in a metallic pipe 3 and electrically insulating powder (4) packed in the pipe. A metallic powder of the specific type is added to the electrically insulati... | 03/19/1985 |
| 4491822 | Heat sensitive cable A heat sensitive cable operable over a temperature range of between approximately -20° F. and 1650° F. The cable includes a tubular metallic sheath which is substantially temperature resistant and moisture impervious. It also includes a mass of compacte... | 01/01/1985 |
| 4435693 | Electrical insulating refractory composition Sheathed electrical heating elements containing MgO heat conductive, electrical insulating material having a high degree of calcination together with additives in the form of a clay and fumed silica to increase the electrical resistivity, density and flow... | 03/06/1984 |
| 4424439 | Protective method and circuit arrangement for appliance incorporating sheathed heating element A protective control arrangement for heating units of the type comprising the concentric assembly of a resistance heating element embedded in an insulating material and enclosed within a metallic sheath for limiting the propagation of a rupture in the she... | 01/03/1984 |
| 4376245 | Electrical heating element An electrical tubular element with an outer, metallic casing (1) surrounding a resistor element (2) of a Fe-Cr-Al alloy embedded in an insulating material (3), is given improved durability by adding to the resistor alloy Y, Hf, Sc or one or more lanthanid... | 03/08/1983 |
| 4326122 | Electric heater for nuclear fuel rod simulators The present invention is directed to an electric cartridge-type heater for use as a simulator for a nuclear fuel pin in reactor studies. The heater comprises an elongated cylindrical housing containing a longitudinally extending helically wound heating el... | 04/20/1982 |
| 4319127 | Electric heating elements Electric heating elements, particularly adapted for use in solder pots or in other uses wherein a substance is to be maintained in a molten or plastic condition, and commonly termed in such uses as over-the-side heaters. A conventional tubular heater is d... | 03/09/1982 |
