...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 |
| 6242854 | Indirectly heated cathode for a CRT having high purity alumina insulating layer with limited amounts of Na OR Si In an indirectly heated cathode comprising a heater having an alumina electrical insulating layer formed by layering and sintering alumina particles on a surface of a metal wire and an electron-emitting part that receives heat from the heater and emits th... | 06/05/2001 |
| 6225733 | Activated carbon electrodes for electrical double layer capacitors The fabrication of activated carbon based supercapacitors. In particular, a monolithic activated carbon plate or honeycomb electrodes (4, 6 and 8) made by extrusion, molding, or casting is described. The carbon monolithic plates or honeycombs are fabricat... | 05/01/2001 |
| 5646480 | Metal assist structure for an electroluminescent display An improved electroluminescent display panel has a plurality of parallel metal assist structures deposited on a glass substrate, a plurality of parallel transparent electrodes are deposited over and aligned with the metal assist structures such that each ... | 07/08/1997 |
| 5272414 | Discharge element, method of producing the same and apparatus comprising the same A discharge element comprises a linear electrode and a sheet electrode both of which are provided opposite to each other with an insulator sheet therebetween, in which the linear electrode is formed by plasma spray coating a high-meting point semiconducto... | 12/21/1993 |
| 5012152 | Image intensifier tube comprising coated electrodes Metal parts of an image intensifier tube which are exposed to a high voltage are coated with a layer of aluminum phosphate glass in order to preclude local discharge phenomena; the aluminum phosphate glass can be deposited in a thin, uniform layer already... | 04/30/1991 |
| 4999537 | Structure of electron source and application thereof to electromagnetic wave emitting tubes The electron source disclosed comprises a solid having a first semiconductor layer capable of releasing electrons under the effect of an electrical field, means to make at least one of its faces partially transparent to at least one part of the released e... | 03/12/1991 |
| 4916356 | High emissivity cold cathode ultrastructure A high emissivity cold cathode has alternating cylindrical tube layers, deposited by vapor deposition, of a refractory metal such as niobium and a refractory insulating material such as alumina. The metal layers have a thickness of less than or about 1,00... | 04/10/1990 |
| 4422005 | Channel plate electron multiplier In a channel plate electron multiplier having a stack of perforated conducting sheet dynodes insulated from one another, electrons incident on the input face of the stack which do not enter the channels give rise to unwanted secondary electrons which move... | 12/20/1983 |
| 4345181 | Edge effect elimination and beam forming designs for field emitting arrays The edge effect elimination and beam forming device uses a field effect electron emitter with a conductive material disposed over selected portions of the emitting fibers of the emitter, in electrical contact with the fibers, and in the same plane as the ... | 08/17/1982 |
| 4341965 | Composite electrode and insulating wall elements for magnetohydrodynamic power generating channels characterized by fibers in a matrix A composite element comprises a matrix composed of at least one member selected from the group consisting of oxides, carbides, nitrides and borides and a fibrous material made of at least one member selected from the group consisting of carbon, graphite, ... | 07/27/1982 |
| 4196938 | Gas-discharge chamber electrode and electrode system using same A gas-discharge chamber electrode is proposed, comprising a hollow metal member with an emitting portion on the gas-discharge side and with coolant pipes. The hollow metal member is coated on the outside, except for the emitting portion, with a high-tempe... | 04/08/1980 |
| 4147953 | Cathode construction for linear beam tubes A linear beam tube is provided with a gridded electron gun in which a concave cathode surface is provided with concave channels from which electrons are emitted. The channels may be arranged as concentric annuli. In a preferred embodiment the channels ext... | 04/03/1979 |
| 4097774 | Arc discharge flash lamp and shielded cold cathode therefor A cold cathode arc discharge flash lamp has a cathode assembly in which an electron emissive pellet is secured on the lead wire or rod entering the flash tube envelope. One or more coils of molybdenum or a similar body of ceramic refractory shield the emi... | 06/27/1978 |
| 4079164 | Base metal plate for directly heated oxide cathode A base metal plate for directly heated oxide cathode comprising a plate of Ni-W-Zr alloy containing 20 to 30% by weight of W and 0.3 to 5.0% by weight of Zr, which can further contain a small amount of other reducing element such as Mg, Al, or Si, and hav... | 03/14/1978 |
| 3999096 | Layered, multi-element electron-bremsstrahlung photon converter target A target for converting kinetic energy of a beam of high energy electrons into bremsstrahlung radiation in the forward direction which consists of a first layer of high or medium Z material that converts the electron energy to bremsstrahlung, a second lay... | 12/21/1976 |
| 3973157 | Charged-particle trapping electrode A charged particle collecting body forming part of an electrode comprises a three dimensional network defining a multiplicity of interconnecting free cells. The dimensions of the cells are selected to permit a major portion of charged particles incident t... | 08/03/1976 |
| 3956652 | Device on a metallic gas-discharge vessel for current lead-in through its wall Device on a metallic gas discharge vessel as a current lead-in through its wall. The inner conductor which traverses the container wall is supported by an insulating sleeve. For protection against the action of glow discharges protective gaps are located ... | 05/11/1976 |