Plural Patents (Class 313/554)
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Patent number: 8816583Abstract: An improved mercury dosing composition is described. A method for dispensing mercury with this composition and to discharge lamps containing each composition is also described.Type: GrantFiled: May 13, 2013Date of Patent: August 26, 2014Assignee: Saes Getters S.p.A.Inventors: Alessio Corazza, Diego Di Giampietro, Alberto Coda, Alessandro Gallitognotta
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Publication number: 20140217883Abstract: An improved mercury dosing composition is described. A method for dispensing mercury with this composition and to discharge lamps containing each composition is also described.Type: ApplicationFiled: May 13, 2013Publication date: August 7, 2014Inventors: Alessio Corazza, Diego Di Giampietro, Alberto Coda, Alessandro Gallitognotta
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Publication number: 20140145589Abstract: An electron beam device has a body provided with an exit window, said body is forming or is at least partly forming a vacuum chamber, the vacuum chamber comprising therein a cathode housing and at least one electron generating filament. At least one getter sheet is provided between the cathode housing and the filament. The invention is further comprising a getter sheet for use in an electron beam device and a method of manufacturing an electron beam device comprising at least one getter sheet.Type: ApplicationFiled: June 27, 2012Publication date: May 29, 2014Applicant: Tetral Laval Holdings & Finance S.A.Inventors: Werner Haag, Dominique Cloetta, Urs Hostettler, Benno Zigerlig, Toni Waber
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Publication number: 20120049729Abstract: A getter assembly which is mounted in a getter chamber is provided. The getter assembly comprises a plurality of getter, support units to support the plurality of getter. When the getter assembly is mounted the getter chamber, the support unit is elastically deformed to create a pressing force against the plurality of spacer, thereby the getter assembly maintain fixedly in the getter chamber.Type: ApplicationFiled: July 25, 2011Publication date: March 1, 2012Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hyun-seung CHO, Dong-su CHANG, Jae-young LEE
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Patent number: 8058803Abstract: Provided is an organic EL display device in which a large amount of a moisture absorbent is formed in a limited narrow region. An organic electroluminescence display device includes a rectangle element substrate having a display region; and a sealing substrate firmly adhered to the element substrate at a protrusion formed on the periphery thereof, in which a moisture absorbent is formed in a region of a concave surface surrounded by the protrusion so as not to overlap the display region, and the moisture absorbent includes moisture absorbents which are formed of a plurality of linear pattern set each joined to adjacent another moisture absorbents so as to be disposed in parallel with each other, and the crosssections of the moisture absorbents intersecting the longitudinal direction of the moisture absorbents are formed in the shape of a plurality of mounds joined to each other.Type: GrantFiled: July 31, 2008Date of Patent: November 15, 2011Assignee: Hitachi Displays, Ltd.Inventors: Issei Takemoto, Nobuhiko Fukuoka, Hitoshi Azuma
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Publication number: 20110234091Abstract: The present invention provides a non-evaporable getter for an FED which can remove a plurality of types of gases. The non-evaporable getter for the FED has a first layer containing titanium, and a second layer containing crystalline zirconium layered on the first layer. The average value of crystalline grain sizes of the crystalline zirconium is 3 nm or more but 20 nm or less.Type: ApplicationFiled: March 14, 2011Publication date: September 29, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Tadayuki Yoshitake, Takuto Moriguchi, Yoichi Ando
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Publication number: 20110148305Abstract: It is provided a dielectric barrier discharge lamp with a metal material in the gas discharge vessel. The metal material increases the efficacy of the lamp.Type: ApplicationFiled: August 14, 2009Publication date: June 23, 2011Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Daiyu Hayashi, Georg Greuel, Rainer Hilbig, Norbert Braun
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Patent number: 7947111Abstract: Novel uses and methods of use for inorganic and macroreticulate polymer bonding to metals to control moisture and oxygen in OLED, and other like devices, are provided. Materials having color change capacity are also provided for the removal of moisture from an OLED, where the material changes color upon reaching its capacity and thereby signals the user that the OLED is no longer protected from moisture damage.Type: GrantFiled: May 21, 2009Date of Patent: May 24, 2011Assignee: Matheson Tri-GasInventors: Robert Torres, Jr., Tadaharu Watanabe, Joseph V. Vininski
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Patent number: 7830090Abstract: A light emission device having an evaporating getter unit and a display device utilizing the light emission device as a light source. The light emission device includes a vacuum vessel having first and second substrates facing each other and a sealing member, the first and second substrates having an active area and a non-active area, an electron emission unit located on the first substrate at the active area, a light emission unit located on the second substrate at the active area, a getter unit provided between the first and second substrates at the non-active area, and a barrier disposed between the getter unit and the active area. The barrier blocks diffusion of getter material toward the active area during the getter activating process and prevents (or reduces) a slip or a movement of the getter unit.Type: GrantFiled: February 22, 2008Date of Patent: November 9, 2010Assignee: Samsung SDI Co., Ltd.Inventors: Hyeong-Rae Seon, Dong-Su Chang, Jae-Young Lee
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Patent number: 7745995Abstract: A flat panel display (7) generally includes a front substrate (79) and a rear substrate (70) opposite thereto. The front substrate is formed with an anode (78). The rear substrate is formed with a cathode (71) facing the anode. Several sidewalls (72) are interposed between the front substrate and the rear substrate. A plurality of getter devices (82) are arranged on the front substrate. Thereby, a chamber between the front substrate and the rear substrate is maintained as a low-pressure vacuum. Each of the getter devices includes a base (820), a getter layer (822) comprised of non-evaporable getter material formed thereon, and securing wires (84) arranged on the base.Type: GrantFiled: May 10, 2006Date of Patent: June 29, 2010Assignees: Tsinghua University, Hon Hai Precision Industry Co., Ltd.Inventors: Liang Liu, Jie Tang, Cai-Lin Guo, Bing-Chu Du, Zhao-Fu Hu, Pi-Jin Chen, Shou-Shan Fan
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Patent number: 7626325Abstract: An image display apparatus includes a front substrate, and a rear substrate opposed to the front substrate. The front substrate has phosphor layers, resistor layers provided between the phosphor layers, a metal-back layer divided into metal-back segments covering the phosphor layers and resistor layers at least in part, and spaced apart by gaps Gx in a first direction intersecting at right angles with a scanning direction and by gaps Gy in a second direction identical to the scanning direction, and a voltage-applying portion which applies a voltage on the metal-back segments. Rx(100)/Rx(1)<Ry(100)/Ry(1) is satisfied, where Rx(V) is a resistance between any two metal-back segments on the sides of a gap Gx, respectively, which is the function of voltage V [V], and Rx(V) is a resistance between any two metal-back segments on the sides of a gap Gy, respectively, which is the function of the voltage V [V].Type: GrantFiled: June 26, 2007Date of Patent: December 1, 2009Assignee: Canon Kabushiki KaishaInventors: Hirotaka Murata, Keiji Suzuki
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Patent number: 7553355Abstract: Novel uses and methods of use for inorganic and macroreticulate polymer bonding to metals to control moisture and oxygen in OLED, and other like devices, are provided. Materials having color change capacity are also provided for the removal of moisture from an OLED, where the material changes color upon reaching its capacity and thereby signals the user that the OLED is no longer protected from moisture damage.Type: GrantFiled: June 23, 2004Date of Patent: June 30, 2009Assignee: Matheson Tri-GasInventors: Robert Torres, Jr., Tadaharu Watanabe, Joseph V. Vininski
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Patent number: 7521864Abstract: An electron device such as a fluorescent display tube is provided, wherein a simple ring-less getter can be simply fixed and arranged with a large degree of freedom. The ring-less getter is securely fixed to the inner surface of the glass anode substrate using laser beams. The laser beam is irradiated onto the ring-less getter from outside the anode substrate. Thus, the laser beam passes through the anode substrate thus heating and melting the ring-less getter. The corresponding inner surface of the anode substrate is melted through the heating. In cooling, the portion where the ring-less getter and the anode substrate are in a molten state is solidified, so that the ring-less getter is bonded to the anode substrate. The ring-less getter is shaped arbitrarily through press-working a getter material.Type: GrantFiled: May 8, 2003Date of Patent: April 21, 2009Assignee: Futaba CorporationInventors: Shogo Ishige, Yoshihisa Yonezawa, Yukio Ogawa
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Patent number: 7193364Abstract: A method of encapsulating devices including providing a getter layer in the penetration path of atmospheric elements. The getter layer serves as a barrier to potentially deleterious atmospheric components, such as moisture and gases, that penetrate the device. In one embodiment, the getter layer surrounds an active region where active component or components are formed.Type: GrantFiled: September 12, 2002Date of Patent: March 20, 2007Assignee: Osram Opto Semiconductors (Malaysia) Sdn. BhdInventors: Hagen Klausmann, Yuen Sin Lew, Hou Siong Tan, Hooi Bin Lim
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Patent number: 7091662Abstract: In an image display device having in an airtight container an electron source and an image display member that receives electrons from the electron source, an evaporating getter and a non-evaporating getter are stacked in the airtight container. This makes it possible to maintain the vacuum level in the airtight container. The image display device thus obtains a prolonged life and a stable display operation.Type: GrantFiled: July 23, 2003Date of Patent: August 15, 2006Assignee: Canon Kabushiki KaishaInventors: Mitsutoshi Hasegawa, Ihachiro Gofuku, Masaki Tokioka, Kazuya Shigeoka, Tokutaka Miura
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Patent number: 7049748Abstract: A gas discharge tube has a phosphor layer formed and a discharge gas enclosed within an elongated tube which is to serve as the gas discharge tube. The gas discharge tube includes a light-emitting section and a cleaning section for cleaning the discharge gas. The cleaning section is connected to the light-emitting section.Type: GrantFiled: October 3, 2002Date of Patent: May 23, 2006Assignee: Fujitsu LimitedInventors: Akira Tokai, Hitoshi Yamada, Manabu Ishimoto, Tsutae Shinoda
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Publication number: 20040135505Abstract: In an image display device having in an airtight container an electron source and an image display member that receives electrons from the electron source, an evaporating getter and a non-evaporating getter are stacked in the airtight container. This makes it possible to maintain the vacuum level in the airtight container. The image display device thus obtains a prolonged life and a stable display operation.Type: ApplicationFiled: July 23, 2003Publication date: July 15, 2004Applicant: CANON KABUSHIKI KAISHAInventors: Mitsutoshi Hasegawa, Ihachiro Gofuku, Masaki Tokioka, Kazuya Shigeoka, Tokutaka Miura
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Patent number: 6762547Abstract: An image display device of the present invention includes a container having a substrate; an electron source provided thereon; and an image display member which opposes the electron source substrate and which displays an image when being irradiated with electrons emitted from the electron source. In addition, the container further has first getters provided in an image display area which is formed between the image display member and the electron source, and ring non-evaporable second getters which are provided outside the image display area.Type: GrantFiled: September 10, 2002Date of Patent: July 13, 2004Assignee: Canon Kabushiki KaishaInventors: Yutaka Arai, Mitsutoshi Hasegawa
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Patent number: 6630786Abstract: A light-emitting device (42, 68, 80, 90, or 100) suitable for a flat-panel CRT display contains a plate (54), a light-emissive region (56), a light-blocking region (58), and a light-reflective layer (60 or 70). The light-emitting device achieves one or more of the following characteristics by suitably implementing the light-reflective layer or/and providing one or more layers (72, 82, 92, and 100) along the light-reflective layer: (a) reduced electron energy loss as electrons pass through the light-reflective layer, (b) gettering along the light-reflective layer, (c) reduced secondary electron emission along the light-reflective layer, (d) reduced electron backscattering along the light-reflective layer, and (e) reduced chemical reactivity along the light-reflective layer.Type: GrantFiled: March 30, 2001Date of Patent: October 7, 2003Assignees: Candescent Technologies Corporation, Candescent Intellectual Property Services, Inc.Inventors: William J. Cummings, Lawrence S. Pan, Christopher J. Spindt, George B. Hopple, Colin D. Stanners, James C. Dunphy, Shiyou Pei, Theodore S. Fahlen
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Patent number: 6586878Abstract: A metal halide discharge lamp has an ellipsoidal outer envelope with a quartz glass arc tube on its major axis supported by a frame having metal straps engaging pinched ends of the arc tube, which lie in a common pinch plane. An inert gas fill between the arc tube and the envelope establishes convection flow patterns during operation. Getters in the form of strips of ZrAl alloy are welded to the straps at 45° to the pinch plane on opposite sides thereof. The getter orientation improves absorption of impurities during horizontal lamp orientation, so that hydrogen spikes and other problems are eliminated.Type: GrantFiled: December 16, 1999Date of Patent: July 1, 2003Assignee: Koninklijke Philips Electronics N.V.Inventor: Jun Ming Tu
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Patent number: 6570959Abstract: A metal frame x-ray tube (1), includes a gettering system (90) which, when activated, provides a layer (147) of gettering material (98) on a grounded conductive portion (72, 74) of a metal frame or envelope (14). The envelope defines an evacuated chamber (12), which houses an anode (10) and a cathode (18). Moving the gettering material to larger diameter portions of the frame enables substantially larger amounts of gettering material to be provided than in a conventional gettering system, which is typically housed in the cathode assembly (26). Moreover, multiple independently controllable gettering wires (92, 94) facilitate reactivating the gettering material plural times both during the manufacturing process and in the field. This ability to rejuvenate vacuum pumping capability in an x-ray tube that is starting to arc in the field allows for extended x-ray tube life.Type: GrantFiled: July 18, 2001Date of Patent: May 27, 2003Assignee: Koninklijke Philips Electronics N.V.Inventor: Daniel E. Kuzniar
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Patent number: 6489720Abstract: Image-forming apparatuses include getters that are suitably placed. The getters can be fixed using inorganic adhesives and function effectively by suitably setting weight ratios between getter powder and the adhesives.Type: GrantFiled: September 2, 1999Date of Patent: December 3, 2002Assignee: Canon Kabushiki KaishaInventors: Ihachiro Gofuku, Hiroshi Takagi, Mitsutoshi Hasegawa, Kazuya Shigeoka, Yutaka Arai
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Patent number: 6486600Abstract: An image display apparatus which is subjected to getter flashing during manufacturing, for the purpose of increasing the degree of vacuum in the air-tight container thereof, is provided with a getter scattering prevention member comprised of a plurality of getter scattering prevention walls. The getter scattering prevention walls prevent getter material from scattering to the image display portion of the image display apparatus, while allowing for smooth conductance of gas in the air-tight container during evacuation. Thus, evacuation by the getter can be further improved by increasing the area to which getter adheres to, deterioration of the image quality can be prevented by not allowing getter to adhere to the image display portion, the air-tight container can be evacuated in a shorter time, irregularities in brightness of the screen due to uneven pressure within the display portion can be done away with, and a higher degree of vacuum can be attained.Type: GrantFiled: July 6, 1999Date of Patent: November 26, 2002Assignee: Canon Kabushiki KaishaInventors: Hiroo Azuma, Kohei Nakata, Masaaki Ogura
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Publication number: 20020109460Abstract: An image display apparatus is provided with an external housing constituted by members including first and second substrates positioned with a gap therebetween, an electron source positioned on the first substrate in the external housing, and a fluorescent film and an accelerating electrode provided on the second substrate. A first getter is positioned in the image display area in the external housing. And a second getter is so provided as to be insulated from the electron source and the accelerating electrode and as to surround the first getter.Type: ApplicationFiled: April 5, 2002Publication date: August 15, 2002Inventors: Mitsutoshi Hasegawa, Ihachiro Gofuku, Yasuhiro Hamamoto, Kazuya Shigeoka, Yutaka Arai
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Patent number: 6422824Abstract: A getter assembly for use in a vacuum display panel is described. The novel getter assembly can be provided including both a non-evaporative getter and an evaporative getter which are uniquely positioned juxtaposed to each other such that ions emitted by the evaporative getter upon activation substantially shield the non-evaporative getter so that gases emitted by the non-evaporative getter when activated does not affect the state of vacuum in the vacuum display panel. A preferred embodiment of the present invention novel getter assembly is shown for vacuum display panels that have sufficient thickness in the cavity so that the getter assembly can be installed inside the cavity.Type: GrantFiled: September 15, 1999Date of Patent: July 23, 2002Assignee: Industrial Technology Research InstituteInventors: Cheng-Chung Lee, Ruey-Feng Jean
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Patent number: 6127777Abstract: The present invention provides an FED with a getter material deposited and activated on the substrates of the faceplate and the baseplate of the FED. In one embodiment of the invention, a large FED includes a faceplate, a baseplate, and an unactivated non-evaporable getter material. The faceplate has a transparent substrate with an inner surface, and a cathodoluminescent material disposed on a portion of the inner surface. The baseplate has a base substrate with a first surface and an emitter array formed on the first surface. The baseplate and the faceplate are coupled together to form a sealed vacuum space in which the inner surface and the first surface are juxtaposed to one another in a spaced-apart relationship across a vacuum gap. The unactivated non-evaporating getter material is deposited directly on the inner surface and/or the first surface.Type: GrantFiled: July 31, 1998Date of Patent: October 3, 2000Assignee: Micron Technology, Inc.Inventors: Charles M. Watkins, David A. Cathey
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Patent number: 5964630Abstract: A flat-panel device is fabricated by a process in which a pair of plate structures (40 and 42) are sealed along their interior surfaces (40A and 42B) to opposite edges (44A and 44B) of an outer wall (44) to form a compartment. Subsequently, exterior support structure (64) is attached to the exterior surface of one of the plate structures (40) to significantly increase resistance of the compartment to bending. Exterior support structure (66) is normally likewise attached to the exterior surface of the other plate structure (42) after the sealing operation. The compartment is then typically pumped down to a high vacuum through a suitable pump-out port (46) and closed.Type: GrantFiled: December 23, 1996Date of Patent: October 12, 1999Assignee: Candescent Technologies CorporationInventors: Marko M. G. Slusarczuk, Duane A. Haven, Christopher J. Curtin, Theodore S. Fahlen
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Patent number: 5789859Abstract: The present invention provides an FED with a getter material deposited and activated on the substrates of the faceplate and the baseplate of the FED. In one embodiment of the invention, a large FED includes a faceplate, a baseplate, and an unactivated non-evaporable getter material. The faceplate has a transparent substrate with an inner surface, and a cathodoluminescent material disposed on a portion of the inner surface. The baseplate has a base substrate with a first surface and an emitter array formed on the first surface. The baseplate and the faceplate are coupled together to form a sealed vacuum space in which the inner surface and the first surface are juxtaposed to one another in a spaced-apart relationship across a vacuum gap. The unactivated non-evaporating getter material is deposited directly on the inner surface and/or the first surface.Type: GrantFiled: November 25, 1996Date of Patent: August 4, 1998Assignee: Micron Display Technology, Inc.Inventors: Charles M. Watkins, David A. Cathey
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Patent number: 5461281Abstract: To prevent attack on electrodes (4, 5) within a discharge vessel (2) by an ionizable metal halide fill, due to spurious or free oxygen arising within the lamp during operation thereof, which oxygen combines with the metal of the electrodes, and is then dissociated in the arc and re-deposited at the hottest part of the electrode, an oxygen removing getter material is introduced into the discharge vessel. Spurious oxygen arises due to emission of oxygen from the glass wall of the discharge vessel, typically quartz glass, and unavoidable contaminants of the fill substance. The getter material is, preferably, phosphorus, boron or aluminum, a halide of the foregoing, a tungsten boron compound, a tin phosphorus compound, or scandium or a rare earth. If the getter is a halide, iodine, bromine or chloride are suitable. The getter may be introduced in quantities of between 0.05 to 0.6%, depending on the getter substances and the fill composition.Type: GrantFiled: July 7, 1994Date of Patent: October 24, 1995Assignee: Patent-Treuhand-Gesellschaft f. elektrische Gluehlampen mbHInventors: Dietrich Fromm, Guenter Soehring, Richard Ullmann
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Patent number: 5327042Abstract: A halide discharge lamp has a an evacuated outer envelope including a getter comprising from about 60 to about 85 percent zirconium, from about 10 to about 20 percent vanadium, and from about 2 to about 10 percent manganese having an activation temperature of less than about 350 degrees Centigrade for reducing the tendency of the lamps to discolor during operation.Type: GrantFiled: July 2, 1992Date of Patent: July 5, 1994Assignee: Osram Sylvania Inc.Inventors: Simone P. Bazin, Richard A. Parrott, Edward H. Nortrup
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Patent number: 5063323Abstract: Outgassed materials liberated in spaces between pointed field emitter tips and an electrode structure during electrical operation of a field emitter device are vented through passageways to a pump of gettering material provided in a separate space. The passageways may include channels formed through an insulating layer between a base for the field emitters, and the electrode structure, with the channels interconnecting adjacent spaces in a row direction. Where the electrode structure includes a gate electrode layer and an anode layer, similar channels may be formed through an insulator layer provided therebetween. The field emitters may be formed in an arrangement of rows and columns, with the spacing between the columns smaller than the spacing between the rows.Type: GrantFiled: July 16, 1990Date of Patent: November 5, 1991Assignee: Hughes Aircraft CompanyInventors: Robert T. Longo, Zaher Bardai, Arthur E. Manoly, Ralph Forman, Randy K. Rolph
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Patent number: 4924145Abstract: A lamp including a fill gas with a mercury component may be safely dosed with mercury by including at least one mercury capsule in the envelope for subsequent opening by radiant means to dose the closed envelope with mercury. A spring coil or similar means may be used for supporting the capsule in a tubular envelope at a position independent of and separated from the press-seal area. The support means generally comprises a compression positioning member, preferably in the form of a coil spring, having the capsule or capsules secured thereto and further having an uncompressed state prior to insertion in the envelope and a compressed state upon insertion in the envelope for retention of the compression positioning member and as a result, the mercury capsule, in a substantially fixed position in the envelope. Once the capsule is in position, the lamp may be safely closed, and the capsule opened by inductive, or other radiant heating.Type: GrantFiled: December 27, 1988Date of Patent: May 8, 1990Assignee: GTE Products CorporationInventor: Jeffrey P. Buschmann
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Patent number: 4906887Abstract: A high pressure metal vapor lamp including an outer protective envelope having a lens and a reflector member having a base for connecting the lamp to a source of electrical power. An elongaated arc tube is provided extending cross-axially relative to the axis of the lamp, the arc tue being supported by leads extending from the base. A pair of barium flash getters is provided extending from respective ends of the arc tube towards, and in close proximity to, the lens and facing the reflector member.Type: GrantFiled: December 19, 1988Date of Patent: March 6, 1990Assignee: GTE Products CorporationInventors: John A. Scholz, Elliot Wyner
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Patent number: 4743797Abstract: In a flat cathode ray display tube having an electron gun adjacent a rear wall of the tube's envelope which produces an electron beam travelling across the rear wall before being turned in the opposite direction and then deflected onto a screen carried by faceplate opposite the rear wall, getter means is situated in one or more recesses, each defined at least in part by an elongate rib formed in the rear wall, e.g. by pressing, with the recess wall shielding the getter means directly from the gun to prevent contamination. The rib serves also to strengthen the rear wall. A line scanning deflector is similarly shielded.Type: GrantFiled: September 8, 1986Date of Patent: May 10, 1988Assignee: U.S. Philips CorporationInventors: David L. Emberson, Adrian Caple
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Patent number: 4571158Abstract: A getter sorption pump has at least one getter member of non-evaporation getter material and a corresponding heating element. With this getter pump, a high pump rate is achieved by means of an extremely large surface in the smallest possible space. For this purpose, the heating element is disposed in an insulating tube and a plurality of individual getter members are attached to the insulator tube at a spacing from one another. The getter pump is employed in high-vacuum and gas discharge systems.Type: GrantFiled: August 27, 1984Date of Patent: February 18, 1986Assignee: Siemens AktiengesellschaftInventor: Heinz Maegdefessel
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Patent number: 4489275Abstract: In accordance with the invention, an improved sample heating apparatus is provided comprising an evacuated cylindrical envelope having a first portion of reduced diameter and capable of fitting into a cavity of a spectroscopic analysis device and capable of receiving a sample holder therein. A second portion of the cylindrical envelope has a larger diameter and heating means mounted therein. Radiation shielding means are also carried within the evacuated envelope of the larger diameter portion. The apparatus is also provided with gettering means to react with gases within the evacuated envelope.Type: GrantFiled: September 9, 1982Date of Patent: December 18, 1984Assignee: SRI InternationalInventors: Kenneth M. Sancier, Bernard J. Wood
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Patent number: 4430599Abstract: A tungsten-halogen lamp employs a quantity of loose copper particles within the envelope to function as an oxygen getter. The loose particles allow the copper to be positioned in the lowest, and thus coolest, part of the lamp whereby the lamp can be burned in any orientation.Type: GrantFiled: April 28, 1982Date of Patent: February 7, 1984Assignee: GTE Products CorporationInventor: Carl F. Kackenmeister