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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7372054 | Radiator module Radiation module for thermal or UV irradiation processing procedures with a large number of radiation sources essentially adjacent and parallel to one another for electromagnetic radiation whose main effective range is in the UV spectrum, visible spectrum, and/or ne... | 05/13/2008 |
| 6450088 | Heat sealing apparatus for plastic bags An improved plastic bag sealing apparatus comprised of an improved resilient planar heater formed of a heating wire embedded in a resilient silicon rubber material. The heater is shaped to conform to the flat planar surface of a T-bar shaped heating eleme... | 09/17/2002 |
| 6308008 | IR-source with helically shaped heating element An infrared radiation lamp that includes an electrically heated filament and a reflector. The filament is a high temperature element that is wound to a helical configuration. The helical filament is free-standing at operating temperatures, and it is posit... | 10/23/2001 |
| 5578232 | Open-coil heater assembly and insulator therefor An open coil electric heater comprising a rigid support frame composed of a pair of longitudinally extending, laterally spaced members, with cross members between and secured to the longitudinal members. The cross members carry ceramic insulator members w... | 11/26/1996 |
| 5426351 | Heater coil for electron tube A heater coil for an electron tube includes a spiral wire which is double wound to be cylindrical, and a connection wire which is formed on an upper face of the spiral wire in a horizontal plane. The connection wire is shaped to have at least two bent por... | 06/20/1995 |
| 5243319 | Trimmable resistor network providing wide-range trims A trimmable resistor network including a plurality of series-connected sections each including a plurality of paralleled link resistors each capable of being cut so as to be eliminated from the network, the paralleled resistors in each section having resi... | 09/07/1993 |
| 5229743 | High voltage protection resistor A protection arrangement for a high voltage tube includes a low inductance disk resistor connected in series with the anode of the tube. When an electrical discharge occurs within the tube, the increased anode current flows through the resistor which abso... | 07/20/1993 |
| 5196678 | Radiant heater, as well as method and apparatus for its production A radiant heater with partly embedded and otherwise projecting heating coils (16) is produced in that the coils (16) are placed in grooves (14) of a tool or mould (13), the interior of the heating coils is partly filled with a filling material (17) and th... | 03/23/1993 |
| 5165052 | Slide-in resistor grid A resistor grid for dynamic braking of diesel electric locomotives has a rigid frame comprising outer metal side pieces and metal dividers within the frame between which are positioned columns of fan-folded resistor ribbon. The dividers carry support plat... | 11/17/1992 |
| 4668855 | Supports for electric heating elements A support for an electric heating element comprises a former of generally cylindrical shape, made of a heat resisting material and having a longitudinal core from which extend spaced ribs that support an outer wall. Portions of the outer wall and of the r... | 05/26/1987 |
| 4572938 | Process for uniting sleeve members by brazing Small portable electrical resistance heated radiant heating unit useful for insertion in tube bores to effect localized high temperature heating. Useful for the internal heating of tubes and tube/sleeve assemblies in steam generators, for brazing, stress ... | 02/25/1986 |
| 4549071 | Glow plug for use in diesel engine In a glow plug for use in a diesel engine of the type comprising a first helical heating member, a second helical heating member connected to the first heating member and made of material having larger positive resistance temperature coefficient than that... | 10/22/1985 |
| 4538051 | Heating element for heating boiling plates, hotplates and the like A radiant heating element for heating a glass ceramic plate carries on a circular insulating support heating elements in the form of wire coils fixed thereto, which are arranged in the form of two parallel spiral paths. Two separately switchable heating c... | 08/27/1985 |
| 4523177 | Small diameter radiant tube heater Small portable electrical resistance heated radiant heating unit useful for insertion in tube bores to effect localized high temperature heating. Useful for the internal heating of tubes and tube/sleeve assemblies in steam generators, having bores as smal... | 06/11/1985 |
| 4481411 | Electrical heater rack assembly with stand-off insulators A heater rack assembly, of the type which supports an electric heating coil in a pattern of parallel rows in a plane, utilizes double-ended stand-off insulators which are formed wafer-like in the plane. The insulators have, at each end, pairs of hook port... | 11/06/1984 |
| 4476378 | Glow plug for use in diesel engine A glow plug for use in a diesel engine comprises first and second helical heaters covered with a sheath. The second heater is made of material having larger resistance temperature coefficient than that of the first heater. A gap larger than winding pitche... | 10/09/1984 |
| 4462020 | Miniature resistive temperature detector and method of fabrication A miniature resistive temperature detector is fabricated by winding wire about a ceramic, or equivalent, cement coated graphite mandrel or form having a greater length than the resulting detector, coating the wire except for the lead portion with a cerami... | 07/24/1984 |
| 4412183 | AC Resistor attenuator and associated amplifier circuits An AC resistor attenuator with low parasitic capacitance coupling and, thus, a substantially constant attenuation value over a relatively wide frequency range is disclosed. The AC resistor attenuator comprises a first elongate resistor substantially entir... | 10/25/1983 |
| 4393299 | Electric radiant heater unit for a glass ceramic top cooker An electric radiant heater unit for a glass ceramic top cooker includes an inner circular heating coil and an outer annular coil surrounding the circular coil. The two coils are separated by a dividing wall of thermal insulating material and the annular c... | 07/12/1983 |
| 4350872 | Electrical heating element for fluid media and method for producing same An electrical heating element for fluid media, more particularly for hot air appliances, comprising a support member of insulating material and at least two heating conductors which are made of resistance wire and which surround the support member, the he... | 09/21/1982 |
| 4337390 | Electric heating element An improved electrical heating element is constructed to increase the amount of electrical wire per unit space available for plug-type convection heating units. The heating element includes a metal frame structure with a plurality of spaced support elemen... | 06/29/1982 |
| 4308477 | Starting resistance for a rotating electrical machine A rotating starting resistance for a rotating electrical machine is disclosed. The resistance includes a helicoidal resistance wire that is wound in the shape of a torus, and connected to the rotating shaft of the electrical machine. The resistance wire m... | 12/29/1981 |
| 4250399 | Electric heating elements An open coil electric heater comprising a rigid support frame composed of a pair of longitudinally extending, laterally spaced members, with cross members between and secured to the longitudinal members. The cross members carry ceramic coil supports which... | 02/10/1981 |
| 4247842 | Cut-in resistance for motor vehicle heating fans This specification discloses a cut-in resistance for motor vehicle heating fans with a first resistance wire winding which can be cut into an electric fan motor either alone or in series with a second resistance wire winding. The first winding is arranged... | 01/27/1981 |
| 4243872 | Electrical heating element An improved electrical heating element is constructed in such a manner as to increase the amount of electrical wire per unit space available for plug-type convection heating units. The plug uses a rectangular-shaped frame which has a plurality of spool co... | 01/06/1981 |
| 4237444 | Heavy-duty precision wire-wound alternating-current resistor and method of making A heavy-duty precision wire-wound alternating-current resistor comprises a capsule filled with a liquid dielectric formed of a low-viscosity liquid perfluorinated organic compound. Within the capsule of the resistor there is arranged a sectionalized bobbi... | 12/02/1980 |
| 4129849 | Fault current limiting resistor A fault current limiting resistor for high energy dissipation includes a frustro-conical support structure where the resistor wire is wound on the support structure in the form of a three dimensional spiral. This provides optimum voltage clearances even w... | 12/12/1978 |
| 4072921 | Low inductance precision resistor deposited on an adhesive backing and wound on a bobbin A precision resistor wherein the resistor wire is deposited in a sinuous pattern on the adhesive surface of a thin, flexible tape of electrical insulating material. In winding the tape onto a multibobbin coil form the intermediate flanges of the coil form... | 02/07/1978 |
| 4039995 | Electric heating elements An electric resistance heating element, comprising at least two elongated dielectric bodies, each having a plurality of openings extending longitudinally thereon in radially displaced, parallel relation. Three metal pins fit into openings in the dielectri... | 08/02/1977 |
| 4021769 | Electrical heating element An elongated electrical heating element comprises intertwisted helical strands of metal wire. Some of the strands extend the full length of the heating element and other strands extend predetermined shorter distances to provide two or more zones having di... | 05/03/1977 |
