Patents Represented by Law Firm Hoffmann, Meyer & Hanson
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Patent number: 4002473Abstract: The process for producing anodes on fixtures comprises the following steps. A stringer with risers of film forming metal welded at right angles to the stringer is lowered into row of cavities in an elastomeric mold which have been filled with a slurry including a freezable bonding agent and film-forming metal powder. The risers are centered in the cavities. The powder slurry is frozen with the risers held in registration with the mold pattern. After solidification of the slurry the stringer is withdrawn and the frozen anodes are pulled out of the mold cavities. Predrying preferably with the risers in place prior to freezing removes excess water so that the anodes after thawing will retain their shape and have sufficient strength to withstand the limited handling necessary to transfer them to the sintering equipment.Type: GrantFiled: November 29, 1973Date of Patent: January 11, 1977Assignee: P. R. Mallory & Co., Inc.Inventor: Gerhart P. Klein
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Patent number: 3992199Abstract: An electrical contact material consisting essentially of a highly conductive metal such as gold or silver, a refractory constituent such as tungsten, molybdenum, tantalum, titanium, their carbides, or mixtures thereof and a bonding constituent of at least two metals that form an alloy selected from the iron group (Group VIII of the Periodic Table of the Elements), and copper. The material has improved properties including improved resistance to arc erosion, resistance to bleeding of the highly conductive metal, and resistance to welding or sticking when used as an electrical contact material.Type: GrantFiled: December 18, 1975Date of Patent: November 16, 1976Assignee: P. R. Mallory & Co., Inc.Inventor: Lloyd F. Neely
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Patent number: 3990395Abstract: An apparatus for forming an electrically insulating semi-cured or cured in situ polymer containing material over a surface of an electrode can of an electrical device. The apparatus includes an applicator forming a film of curable polymer containing material over the can and means semi-curing or curing in situ the film to form an electrically insulating semi-cured or cured polymer containing material over the surface of the electrode can. The film is formed by contacting a surface of the electrode can with curable polymer containing material dispensed from the applicator and moving the surface of the electrode can contacted with the material over the applicator to distribute the curable polymer containing material over the surface of the electrode can as a film.Type: GrantFiled: December 30, 1974Date of Patent: November 9, 1976Assignee: P. R. Mallory & Co., Inc.Inventors: William J. Evans, Edwin R. Koons, Kevin J. Killigrew
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Patent number: 3991289Abstract: An automatic timer switch includes a time-of-day indicating means, a means for determining and indicating the cessation of a timed switching function, and a means for determining and indicating the duration of a timed switching function.Type: GrantFiled: August 5, 1974Date of Patent: November 9, 1976Assignee: P. R. Mallory & Co., Inc.Inventor: Richard H. Weber
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Patent number: 3989516Abstract: A method of making silver-cadmium oxide-tin oxide type contact materials by oxidizing three-dimensional particles containing silver, cadmium, and tin and then consolidating the oxidized particles into bodies of the desired configuration. The resultant contact materials have a substantially uniform distribution of relatively coarse cadmium oxide particles, improved arc erosion properties, and little or no depleted or porous grain boundaries.Type: GrantFiled: September 29, 1975Date of Patent: November 2, 1976Assignee: P. R. Mallory & CO., Inc.Inventor: Fredrik O. Haarbye
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Patent number: 3988118Abstract: This invention is directed to the use of tungsten base alloys containing about 1 to 12 weight percent nickel, about 0.5 to 8 weight percent iron and about 0.5 to about 25 percent molybdenum and at least one additional additive selected from cobalt, chromium, manganese, vanadium, tantalum, zirconium, titanium, yttrium, rhenium, boron, and silicon. Chromium may substitute for molybdenum up to 15%. In addition to being useful for high density applications, structural applications, and high temperature applications, the alloys may be used for die casting dies, molds, cores and other metal shaping members.Type: GrantFiled: March 10, 1975Date of Patent: October 26, 1976Assignee: P. R. Mallory & Co., Inc.Inventors: Robert Grierson, Earl I. Larsen
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Patent number: 3988727Abstract: A timed switching circuit includes timer means for timing an event, timer means for timing the length of an alarm signal, and timer means for timing delays prior to and immediately after an event is timed. The circuit also includes an appliance control/indicator means for controlling an appliance in response to a timed event and indicating the operational state thereof.Type: GrantFiled: June 24, 1974Date of Patent: October 26, 1976Assignee: P. R. Mallory & Co., Inc.Inventor: Charles E. Scott
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Patent number: 3976435Abstract: Porous anodes suitable for use in capacitors which involves forming moistened metal powder into a mass, freezing the moistened mass thereby bonding the metal powder together and sintering the mass to convert it to a porous pellet suitable for use as an anode for a capacitor. The anodes have a sintered density below 12 g/cc and specific capacitance of at least 2,000 uFV/g.Type: GrantFiled: November 2, 1973Date of Patent: August 24, 1976Assignee: P. R. Mallory & Co. Inc.Inventor: Gerhart P. Klein
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Patent number: 3973135Abstract: Two timing means are connected by a switching means, one of the timing means being operable to de-energize a load, the other energizing another load for a predetermined time after the first load has been de-energized.Type: GrantFiled: May 12, 1975Date of Patent: August 3, 1976Assignee: P. R. Mallory & Co., Inc.Inventor: Charles E. Scott
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Patent number: 3971970Abstract: The disclosure relates to an electrical component with low impedance over a range of high frequency input signals. The electrical component comprises a dielectric film-forming metal anode with an anode lead projecting from the anode, electrolyte contacting the surfaces of the anode to form a body, and a cathode lead contacting the body and substantially parallel to the plane of the anode lead. Preferably, the length of the anode lead and the cathode lead are a minimum as well as is the distance between the anode lead and the cathode lead in order to help reduce the impedance of the electrical component over a range of high frequency input signals. Surfaces of the body are at an angle with respect to each other. The cathode lead includes an elongated strip of electrically conducting material projecting from the body and a surface of the strip is joined to one or more of the surfaces of the body at an angle with respect to each other.Type: GrantFiled: November 27, 1974Date of Patent: July 27, 1976Assignee: P. R. Mallory & Co., Inc.Inventors: Gerald A. Voyles, Edward M. Moss
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Patent number: 3967000Abstract: A protective layer containing polytetrafluoroethylene (PTFE) is provided over the riser of an anode having a porous film-forming metal anode body to render the riser non-wetting to a solution of manganese nitrate and thereby help prevent the formation of MnO.sub.2 on the riser during the subsequent pyrolysis step in the process of making a capacitor. The protective layer also helps to prevent mechanical damage to the anode during assembly of the capacitor. The protective layer over the anode riser may be applied by means such as dipping a wetted anode in a suspension containing particulate PTFE or by masking the anode body with a liquid and then spraying the riser with binderless material containing PTFE. The preferred embodiment employs high pressure spraying of the material containing PTFE over the anode riser.Type: GrantFiled: June 13, 1974Date of Patent: June 29, 1976Assignee: P. R. Mallory & Co., Inc.Inventors: Gerhart P. Klein, Milton Kallianidis
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Patent number: 3964664Abstract: A sleeve is held in a fixed position as a heating rod, which surrounds the sleeve, is lowered to engage an element carried by the sleeve so as to disengage the element from the sleeve and weld it to a substrate.Type: GrantFiled: August 20, 1975Date of Patent: June 22, 1976Assignee: P. R. Mallory & Co., Inc.Inventors: Steven J. Butler, Arthur Harley Clawson, Jr., Robert Jackie Ward
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Patent number: 3965454Abstract: An electrical contact arm having an electrical contact engaging a collector path also has at least two electrical contacts engaging a resistance path, the resistance path having rows of discrete spots of a good electrically conductive material spaced along the resistance path, the number of rows being equal to the number of electrical contacts engaging the resistance path, and the spots of one row being staggered with respect to the spots of another row such that at least one of the electrical contacts engaging the resistance path will be in engagement with one of the spots as the contact arm moves along the collector and resistance paths.Type: GrantFiled: September 12, 1974Date of Patent: June 22, 1976Assignee: P. R. Mallory & Co., Inc.Inventor: George O. Puerner
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Patent number: 3963502Abstract: A surface, such as a die casting cavity surface, is coated with a substantially continuous thin film including a metal oxide of tungsten or molybdenum or mixtures thereof and carbon in the amorphous or crystalline allotropic form. A composition used in a method to provide the coating over the surface includes the carbon in the amorphous or crystalline allotropic form suspended in a liquid including water and the metal oxide or acid of tungsten or molybdenum or mixtures thereof dissolved in a hydroide. The method of coating the surface includes the steps of providing the surface to be coated with an oxide film, applying the composition over the oxide film, and treating the applied composition to form the substantially continuous thin film including the metal oxide of tungsten or molybdenum or mixtures thereof and the carbon in the amorphous or crystalline allotropic form. The thin film is capable of causing modification of selected properties of the surface related to shaping of metal containing materials.Type: GrantFiled: September 27, 1974Date of Patent: June 15, 1976Assignee: P. R. Mallory & Co., Inc.Inventors: Alexander S. Borbely, Jon A. Bereman
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Patent number: 3961327Abstract: A buzzer arm is attached to a synchronous motor to provide an audible alarm in response to energization of a winding of the motor and the relative position of the buzzer arm to a buzzer anvil extending from the motor.Type: GrantFiled: July 22, 1974Date of Patent: June 1, 1976Assignee: P. R. Mallory & Co., Inc.Inventors: Ernest F. Kloenne, Kanti D. Patel
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Patent number: 3960105Abstract: Energy is slowly stored in at least two spring members mounted juxtaposition one another, the stored energy being released substantially instantaneously and individually, a single member engaging a striker first, the striker then engaging an alarm device such as a bell, subsequent members striking prior members to move the striker and again engage the alarm device.Type: GrantFiled: February 14, 1975Date of Patent: June 1, 1976Assignee: P. R. Mallory & Co., Inc.Inventor: Thomas F. Ring
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Patent number: 3959731Abstract: Starting at the same time, two timing means produce a series of output pulses at slightly different frequencies. When the two output pulses coincide, a single output pulse is produced. This will occur at a frequency equal to the difference between frequences of two original timing means and the interval between the single outputs will increase as the difference between the frequencies of the two timing means is made smaller.Type: GrantFiled: March 14, 1973Date of Patent: May 25, 1976Assignee: P. R. Mallory & Co., Inc.Inventors: Daniel I. Pomerantz, David O. Veinot
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Patent number: 3949279Abstract: An anode assembly capable of performing an electrical function including support means of an electrically conducting, dense material. The support means has an enlarged portion and an elongated portion. The enlarged portion of the support means includes a recessed section. The opening of the recessed section faces away from the elongated portion of the support means in a direction substantially parallel to the central longitudinal axis of the elongated portion. A continuous, porous deposit of particulate, electrically conducting material such as particulate metal is over the recessed section. The porous deposit is capable of performing as an anode upon further processing.Type: GrantFiled: June 6, 1973Date of Patent: April 6, 1976Assignee: P. R. Mallory & Co., Inc.Inventor: William Fredrick Vierow
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Patent number: 3940667Abstract: In combination an electrode and a radiation semi-cured or completely cured polymer containing material suitable for use in an electrical device. The electrode includes a metal containing material. Contiguous to the metal containing material is a radiation semi-cured or completely cured polymer containing material. The semi-cured or completely cured polymer containing material retains electrolyte. The polymer containing material may contain a dielectric filler such as paper and the like.A method of making the combination of the electrode and radiation semi-cured or completely cured polymer containing material including the steps of applying radiation curable polymer containing material to the electrode or to a dielectric filler to be used in the combination, irradiating applied material to semi-cure or completely cure the applied material and introducing electrolyte to the applied polymer containing material.Type: GrantFiled: March 4, 1974Date of Patent: February 24, 1976Assignee: P. R. Mallory & Co. Inc.Inventor: Godfrey R. Pearce