Patents by Inventor Jan Hasker
Jan Hasker has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5936334Abstract: A cathode having a matrix body (1) impregnated with an alkaline earth compound, whose surface is provided with a top coat (2, 3, 4) comprising a high melting point metal, such as particularly tungsten, and scandium. A high emission at a low operating temperature and simultaneously a rapid recuperation after ion bombardment as well as a long lifetime are achieved in that the top coat comprises at least two layers of different composition, with a purely metallic layer (5, 6, 7) being provided on the impregnated matrix body (1), which layer comprises scandium and a high melting point metal such as particularly tungsten and/or rhenium, and in that a metallic layer of a high melting point metal such as particularly tungsten is provided as a sealing layer.Type: GrantFiled: October 31, 1994Date of Patent: August 10, 1999Assignee: U.S. Phillips CorporationInventors: Georg Gartner, Jan Hasker
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Patent number: 5518520Abstract: Method of manufacturing a dispenser cathode, in which method tungsten and a scandium-containing material are mechanically alloyed and the product thus formed is pressed into a cathode body. The cathode body is further provided with a barium-containing component. In the mechanical alloying process the tungsten is highly deformed and the scandium-containing material is mixed with the tungsten so as to be very finely distributed therein, so that an improved dispensation of scandium and hence an improved recovery after ion bombardment of the final cathode is attained.Type: GrantFiled: March 6, 1995Date of Patent: May 21, 1996Assignee: U.S. Philips CorporationInventors: Jan Hasker, Robert H. Kane, Paul D. Goodell, Jacobus A. J. M. Deckers
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Patent number: 5407633Abstract: Method of manufacturing a dispenser cathode, in which method tungsten and a scandium-containing material are mechanically alloyed and the product thus formed is pressed into a cathode body. The cathode body is further provided with a barium-containing component. In the mechanical alloying process the tungsten is highly deformed and the scandium-containing material is mixed with the tungsten so as to be very finely distributed therein, so that an improved dispensation of scandium and hence an improved recovery after ion bombardment of the final cathode is attained.Type: GrantFiled: March 15, 1994Date of Patent: April 18, 1995Assignee: U.S. Philips CorporationInventors: Jan Hasker, Robert H. Kane, Paul D. Goodell, Jacobus A. J. M. Deckers
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Patent number: 5261845Abstract: A cathode body for an impregnated scandate cathode is obtained by compressing and sintering a mixture of tungsten powder with approximately 0.5% by weight of scandium, whereafter the body is impregnated.Type: GrantFiled: July 30, 1991Date of Patent: November 16, 1993Assignee: U.S. Philips CorporationInventors: Johannes Van Esdonk, Jan Hasker, Josef Van Lith
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Patent number: 5064397Abstract: For maintaining a monolayer of scandium which is necessary for a satisfactory emission on the surface of a scandate cathode, at least the top layer of the cathode is provided with scandium coated with a scandium oxide film. Even after repeated ion bombardment the emission is found to recover up to approximately 90% of the initial value at a current density of ca. 100 A/cm.sup.2.Type: GrantFiled: February 16, 1990Date of Patent: November 12, 1991Assignee: U.S. Philips CorporationInventors: Jan Hasker, Jacobus E. Crombeen, Petrus A. M. Van Dorst, Johannes Van Esdonk, Pieter Hokkeling, Josef J. Van Lith
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Patent number: 5006753Abstract: By providing at least the top layer of the matrix of a scandate cathode with an alloy or compound which exhibits scandium segregation, a satisfactory recovery for cathodes with a high emission can be achieved after ion bombardment.Type: GrantFiled: November 15, 1988Date of Patent: April 9, 1991Assignee: U.S. Philips CorporationInventors: Jan Hasker, Jacobus E. Crombeen, Anton K. Niessen, Henricus J. H. Stoffelen
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Patent number: 4904897Abstract: An oxide cathode comprising a base 1 which consists substantially of titanium and a heater element 5 coated with aluminium oxide 6 to heat the base 1, which bears a porous alkaline earth metal oxide emissive layer 4. When the surface of the titanium base 1 which is opposed to the heater element 5 bears a metal layer 7 consisting at least of one of the metals Pt, Mo, Ta and W, a solution is obtained to the problem occurring in titanium cathodes in that titanium in contact with aluminium oxide is not chemically stable. The metal layer preferably consisits of pure tungsten and is formed by chemical vapour desposition (CVD). The metal layer is preferably from 1 to 10 .mu.m thick.Type: GrantFiled: December 4, 1984Date of Patent: February 27, 1990Assignee: U.S. Philips CorporationInventors: Johannes Van Esdonk, Jan Hasker, Jacobus Stoffels
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Patent number: 4873052Abstract: A method of manufacturing a scandate dispenser cathode having a matrix (1) at least the top layer of which consists substantially of a mixture of tungsten with scandium oxide or with a mixed oxide comprising scandium oxide. When sintering of the matrix is carried out at a temperature between 1300.degree. and 1700.degree. C., preferably at approximately 1500.degree. C. and in a hydrogen atmosphere, cathodes are obtained having a better recovery after ion bombardment compared with cathodes sintered at 1900.degree. C. Sintering in hydrogen results in a better reproducibility.Type: GrantFiled: August 22, 1986Date of Patent: October 10, 1989Assignee: U.S. Philips CorporatonInventors: Jan Hasker, Johannes Van Esdonk, Wim Kwestroo
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Patent number: 4594220Abstract: A method of manufacturing a scandate dispenser cathode having a matrix at least the top layer of which at the surface consists substantially of tungsten (W) and scandium oxide (Sc.sub.2 O.sub.3) and with emitter material in or below said matrix. If said method comprises the following steps:(a) compressing a porous plug of tungsten powder(b) heating said plug in a non-reactive atmosphere and in contact with scandium to above the melting temperature of scandium,(c) cooling the plug in a hydrogen (H.sub.2) atmosphere(d) pulverizing the plug to fragments(e) heating said fragments to approximately 800.degree. C. and firing them at this temperature for a few to a few tens of minutes in a hydrogen atmosphere and slowly cooling in said hydrogen atmosphere(f) grinding the fragments to scandium hydride-tungsten powder (ScH.sub.2 /W)(g) compressing a matrix or a top layer on a matrix of pure tungsten from said ScH.sub.Type: GrantFiled: December 24, 1984Date of Patent: June 10, 1986Assignee: U.S. Philips CorporationInventors: Jan Hasker, Pieter Hokkeling, Johannes van Esdonk, Josef J. van Lith
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Patent number: 4471260Abstract: An oxide cathode comprising a metal base substantially consisting of titanium and a heating element for heating said base, on which base a porous layer comprising an alkaline earth metal oxide is provided. The cathode has a comparatively low operating temperature, a short warm up time and a low power requirement.Type: GrantFiled: January 18, 1982Date of Patent: September 11, 1984Assignee: U.S. Philips CorporationInventors: Jan Hasker, Jacobus H. Jacobs, Peter Opmeer, Johannes A. T. Verhoeven
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Patent number: 4277713Abstract: Low-pressure discharge lamp having an elongate discharge vessel which contains a thinly distributed filamentary body permeable to the gas discharge, said body comprising a helical support filament which is supported by the inner surface of the discharge vessel and is at least one further filament, supported by the support filament and extending therefrom towards the axis fo the discharge vessel.Type: GrantFiled: June 27, 1979Date of Patent: July 7, 1981Assignee: U.S. Philips CorporationInventors: Jan Hasker, Johannes C. G. Vervest, Cornelis Peters, Laurentius C. J. Vroomen
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Patent number: 4221988Abstract: A low pressure gas discharge lamp having a body present in the discharge vessel which consists of a longitudinal support which extends into the longitudinal direction of the vessel, the support being provided with fibers which are distributed over the space within the discharge vessel and extend substantially transversely from the support.Type: GrantFiled: October 31, 1978Date of Patent: September 9, 1980Assignee: U.S. Philips CorporationInventors: Jan Hasker, Petrus R. van Ijzendoorn, Hendrik Roelofs
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Patent number: 4179777Abstract: A method of producing low-pressure gas discharge lamps wherein filamenting wool is prepared into a mat and then brought into the discharge space.Type: GrantFiled: February 7, 1977Date of Patent: December 25, 1979Assignee: U.S. Philips CorporationInventors: Jan Hasker, Cornelis Peters
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Patent number: 4163169Abstract: A low-pressure gas discharge lamp in which thin-structured bodies are present in the discharge space for increasing the radiation output per unit volume.Type: GrantFiled: September 25, 1975Date of Patent: July 31, 1979Assignee: U.S. Philips CorporationInventor: Jan Hasker
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Patent number: 4143447Abstract: A method for manufacturing a low pressure gas discharge lamp having a body present in the discharge vessel which consists of a longitudinal support which extends into the longitudinal direction of the vessel. The support being provided with fibres which are distributed over the space within the discharge vessel and extend substantially transversely from the support.Type: GrantFiled: February 13, 1978Date of Patent: March 13, 1979Assignee: U.S. Philips CorporationInventors: Jan Hasker, Petrus R. VAN Ijzendoorn, Hendrik Roelofs
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Patent number: 4101185Abstract: A method of producing a low-pressure gas discharge lamp in which a body of a solid material having a thin, structure of filaments permeable to the gas discharge such as glass wool is disposed. Coherence is given to the filaments by compressing them whereafter they are sucked into the lamp envelope. Compressing, knitting together and producing the wire-shaped elements is done in a funnel-shaped space which is connected at its constricted side to the tubular discharge space.Type: GrantFiled: February 1, 1977Date of Patent: July 18, 1978Assignee: U.S. Philips CorporationInventors: Johannes van Esdonk, Jan Hasker, Johannes Cornelis Gerardus Vervest