Patents by Inventor Deborah P. Partlow
Deborah P. Partlow 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: 6673181Abstract: A fabrication process for ferrite toroids which utilizes ferrite ceramic tape having an improved elongation characteristic. The process utilizes a set of rigid mandrels which are employed in the final lamination to support the rectangular cross section of the internal cavity of a respective ferrite tube, thereby reducing stress concentration and permitting the highest lamination pressure to be used in the final step. The mandrels are removed prior to panel densification. The tape and mandrels operate together to minimize cracks and pores in the toroids and provide an added advantage of maintaining high tolerances in the internal cavity dimensions as well as the cavity-to-cavity alignment.Type: GrantFiled: October 29, 2001Date of Patent: January 6, 2004Assignee: Northrop Grumman CorporationInventors: Cynthia W. Berry, Deborah P. Partlow, Alex E. Bailey
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Patent number: 5774025Abstract: A planar phase shifter formed of multiple layers of a ferrite. Selected layers of the ferrite are patterned with a conductor and the multiple layers of magnetic dielectric and conductor are cofired. The phase shifter is fabricated by first obtaining ferrite powder. Then, layers of the ferrite are made, preferably by tape casting. Next the ferrite layers are metallized by applying selected amounts of conductive metals in a selected pattern upon the tape. Selected numbers of vias are placed through selected layers of tape and conductive metal is placed in the vias to provide vertical connections through the layers. The tape layers are then stacked in a predetermined order and are laminated. The laminated stack of layers is then fired to a temperature of approximately 800.degree. C. to 1000.degree. C., sintering the laminated layers into one integrated structure.Type: GrantFiled: August 7, 1995Date of Patent: June 30, 1998Assignee: Northrop Grumman CorporationInventors: John D. Adam, Steven N. Stitzer, Carol J. Painter, Michael R. Daniel, Deborah P. Partlow, Andrew J. Piloto
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Patent number: 5772820Abstract: Materials and methods for the fabrication of high density, low temperature fired microwave ferrites for use in microwave power devices, transmission line elements, isolators, circulators, and phase shifters. Very fine (sub-micron) ferrite powders made by sol-gel methods are mixed with solvents and binders then tape-cast. Ferrite tapes in the unfired state are cut into complex shapes and may be provided with via holes. These ferrite sheets are fired discretely, or are laminated, cofired with printed metal pastes, or other active and passive ceramic tapes.Type: GrantFiled: July 25, 1996Date of Patent: June 30, 1998Assignee: Northrop Grumman CorporationInventors: Karl F. Schoch, Jr., Theodore R. Vasilow, Andrew J. Piloto, Deborah P. Partlow, Kenneth C. Radford
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Patent number: 5769987Abstract: We disclose a fabrication method for integrating passive devices such as capacitors, resistors and circulators into ceramic packages for electronic systems. The method utilizes a glass or glass/ceramic as a bonding agent which is incorporated as one of the layers in the multilayer package. The integration of such passive devices eliminates the tedious mounting of these devices on the package, permitting a smaller, more reliable, less expensive and lighter weight product. This method allows the integration of passive devices having firing temperatures far different from that of the ceramic package itself, permitting combinations of materials that cannot be densified, or cofired together.Type: GrantFiled: November 20, 1996Date of Patent: June 23, 1998Assignee: Northrop Grumman CroprationInventors: Stephen R. Gurkovich, Kenneth C. Radford, Alex E. Bailey, Deborah P. Partlow, Andrew J. Piloto
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Patent number: 5766528Abstract: A method for producing ceramic tape used to fabricate electronic devices while eliminating continued shrinkage of the unfired tape. Chemical agents are added to a mixture of ceramic powder and binder to manipulate the crosslinking of the binder. A first approach involves promoting the crosslinking reaction to completion quickly. The second approach involves preventing the crosslinking reaction during the tape slurry mixing and casting processes. A solvent is used to accelerate the crosslinking of the binder in which the solvent may include one or more of acetone, acetylacetone, toluene and ethanol. Preferably, the solvent is a combination of acetone and acetylacetone. A polyhydroxy compound, such as glycerine, may be added to accelerate the crosslinking reaction of the binder. The boron in the tape may alternatively be rendered inoperative as a crossing agent for the binder by pre-reacting the boron with the Lewis base prior to contact with the binder.Type: GrantFiled: February 14, 1997Date of Patent: June 16, 1998Assignee: Northrop Grumman CorporationInventors: Wei-Fang Su, Deborah P. Partlow
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Patent number: 5757611Abstract: The invention provides for an electronic package having a buried passive component such as a capacitor therein, and a method for fabricating the same. The electronic package preferably includes a passive component portion which includes a plurality of layers of high K dielectric material, a signal processing portion which includes a plurality of layers of low K dielectric material, and at least one buffer layer interposed between the passive component portion and the signal processing portion. Metallization is preferably printed upon at least one of the layers of high K dielectric material and at least one of the layers of low K dielectric material. Preferably, the layers are co-fired at a temperature below approximately 1200.degree. C. to form the electronic package and each of the buffer layers contains approximately 25 to 100% barium compound.Type: GrantFiled: April 12, 1996Date of Patent: May 26, 1998Assignee: Norhtrop Grumman CorporationInventors: Stephen R. Gurkovich, Theodore R. Vasilow, Andrew J. Piloto, Deborah P. Partlow, Kenneth C. Radford, Alex E. Bailey
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Patent number: 5747873Abstract: A system for incorporating superconductor circuits and semiconductor circuits in multilayered structures. A carrier material is chosen that is a good thermal match with the preferred superconductor substrates. The preferred superconductor substrate materials are lanthanum aluminate, magnesium oxide and neodymium gallate. The substrate carrier material should provide adequate thermal match through the range of operating temperatures which are preferably from room temperature to 77K. The preferred carrier material is a low temperature cofired ceramic (LTCC) which allows for multilayered structures to be developed which incorporate the superconductor circuitry and the semiconductor elements. The LTCC is composed of crystalline quartz particles in a borosilicate glass matrix. The percentage of quartz may be adjusted to adjust the thermal expansion characteristics of the LTCC.Type: GrantFiled: September 27, 1996Date of Patent: May 5, 1998Assignee: Northrop Grumman CorporationInventors: Salvador H. Talisa, Michael A. Janocko, Deborah P. Partlow, Andrew J. Piloto
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Patent number: 5744232Abstract: A thick film metallization compatible with low temperature cofired ceramics (LTCC) that displays very low microwave insertion losses commensurate with those of thin film gold. However, the disclosed metallization is applied similar to conventional metallizations by screen printing and has no limit to the number of layers achievable. The electrical performance of the metallization is attained by using a spherical metal particle shape and uniform particle size distribution in the thick film paste. The advantage of this invention is that superior microwave performance can be achieved in electronic packages without the cost and limitations imposed by thin film metallization techniques.Type: GrantFiled: July 11, 1996Date of Patent: April 28, 1998Assignee: Northrop Grumman CorporationInventors: Alex Bailey, Andrew J. Piloto, Deborah P. Partlow
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Patent number: 5683528Abstract: A method for forming a low temperature cofired ceramic package which is made using a multi-layered densified spherical powder formed via a sol-gel process. This densified powder is formed from layers of SiO.sub.2 reacted with trimethyl borate. The spherical powder has a preselected particle size and boron content sufficient to render the low temperature cofired ceramic package fully dense, even in the presence of a second phase filler ceramic, at a sintering temperature below 1000.degree. C. Binder material is added to the spherical powder and ceramic filler to form a plurality of tapes. A ceramic assembly is then formed by layering the plurality of tapes upon one another and firing the ceramic assembly at a temperature below 1025.degree. C. to form a fully dense cofired ceramic package. In order to form the multi-layered densified spherical powder, a silica core, which is formed using a sol-gel process, is reacted with trimethyl borate.Type: GrantFiled: June 5, 1995Date of Patent: November 4, 1997Assignee: Northrop Grumman CorporationInventors: Deborah P. Partlow, Stephen R. Gurkovich, Kenneth C. Radford, Andrew J. Piloto
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Patent number: 5623724Abstract: A ceramic capacitor suitable for high energy density and high temperature application is disclosed. Such a capacitor is prepared by producing the selected ceramic powder via the sol-gel process forming the capacitor to the desired shape with the resulting powder using tape casting technology and firing the "green" form so produced.Type: GrantFiled: August 9, 1994Date of Patent: April 22, 1997Assignee: Northrop Grumman CorporationInventors: Stephen R. Gurkovich, Kenneth C. Radford, Deborah P. Partlow
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Patent number: 5515054Abstract: A dual mode radar transparency allowing passage of both RF radiation and IR radiation comprises an aerogel base and ceramic skin overlaying the aerogel base. The aerogel base comprises a low density ceramic material. A method of fabricating a dual mode radar transparency allowing passage of both RF radiation and IR radiation comprises the steps of preparing a colloidal dispersion of a ceramic material in a medium, increasing a concentration of the colloidal dispersion by evaporation to create a suspension, and placing the suspension in a mold. The suspension is solidified to form an aerogel and the aerogel is joined to a ceramic skin.Type: GrantFiled: April 20, 1994Date of Patent: May 7, 1996Assignee: Westinghouse Electric Corp.Inventors: Kenneth C. Radford, Deborah P. Partlow, Jay E. Lane, Andrew J. Piloto
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Patent number: 5457598Abstract: A multi-layer capacitor comprising a stack of sheet electrodes with an insulating dielectric layer sandwiched between these layers is disclosed. The dielectric layer formed on the electrode is prepared by the "sol-gel" process.Type: GrantFiled: April 8, 1994Date of Patent: October 10, 1995Inventors: Kenneth C. Radford, Stephen R. Gurkovich, Andrew J. Piloto, Deborah P. Partlow
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Patent number: 5387481Abstract: A vanadium oxide compound having the formula VO.sub.2 is disclosed for the purpose of selectively shielding an electromagnetic transmitter or receiver. Vanadium oxide exhibits a marked and rapid transition from dielectric and transparent to electromagnetic radiation to metallic and impervious to such radiation at a specific temperature, 68.degree. C. The compound is preferably mounted as a thin layer on a substrate which has been specifically selected for the desired application. The transmission of radiation is then temperature selected. The preferred method of deposition is an organic hydrolysis reaction.Type: GrantFiled: March 15, 1993Date of Patent: February 7, 1995Assignee: Westinghouse Electric CorporationInventors: Kenneth C. Radford, Deborah P. Partlow
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Patent number: 5370827Abstract: Solutions such as for example drinking water, ground water and extracting solutions contaminated with heavy metals and radioactive species, singly or in combination, are treated by first treating the contaminated solution with silicate and ammonium hydroxide solution precipitants. Then the contaminated solution is separately treated with an acid which gels, polymerizes and/or precipitates the contaminant-containing silica matrix to form an easily dewaterable and separable solid. The solid contaminants are readily removed from the cleansed solution by filtration means. The process utilizes a novel combination of steps which maximizes contaminant removal, minimizes waste volume, and produces a treatable waste solid. The preferred precipitants are sodium silicate, and ammonium hydroxide. The preferred mineral acid is hydrochloric acid.Type: GrantFiled: April 2, 1993Date of Patent: December 6, 1994Assignee: Westinghouse Electric CorporationInventors: David C. Grant, Deborah P. Partlow, Edward J. Lahoda, Leland L. Learn
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Patent number: 5290737Abstract: A composite material having a fiber system embedded in a host matrix material. The fiber system has a protective reaction barrier around the embedded fibers to prevent deleterious chemical or mechanical reaction between the fiber and matrix. The fiber coating is applied by immersion of the fiber system into an alkoxide solution of the desired oxide precursor with controlled immersion and withdrawal rates with subsequent drying, heating to convert to a pure oxide state, and where required, post processing, to convert the oxide coating to a carbide or nitride, for example.Type: GrantFiled: July 22, 1985Date of Patent: March 1, 1994Assignee: Westinghouse Electric Corp.Inventors: Clarence A. Andersson, Deborah P. Partlow, Bulent E. Yoldas, Raymond J. Bratton
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Patent number: 5274241Abstract: A vanadium oxide compound having the formula VO.sub.2 is disclosed for the purpose of selectively shielding an electromagnetic transmitter or receiver. Vanadium oxide exhibits a marked and rapid transition from dielectric and transparent to electromagnetic radiation to metallic and impervious to such radiation at a specific temperature, 68.degree. C. The compound is preferably mounted as a thin layer on a substrate which has been specifically selected for the desired application. The transmission of radiation is then temperature selected. The preferred method of deposition is an organic hydrolysis reaction.Type: GrantFiled: October 14, 1992Date of Patent: December 28, 1993Assignee: Westinghouse Electric Corp.Inventors: Kenneth C. Radford, Deborah P. Partlow
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Patent number: 5242631Abstract: A method for coating a nuclear fuel pellet is provided in which a liquid sol is formed containing the makings of a rare earth metal oxide. The liquid sol is applied to the exterior surface of the nuclear fuel pellet and the pellet is baked to form a solid coated pellet. If desired, zirconium diboride may be dispersed within the rare earth metal oxide matrix. Preferably, the rare earth metal oxide is either erbium oxide or gadolinia.Type: GrantFiled: January 13, 1992Date of Patent: September 7, 1993Assignee: Westinghouse Electric Corp.Inventors: Jayashri N. Iyer, Deborah P. Partlow
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Patent number: 5140498Abstract: A wound thin film capacitor is formed by the method of applying a solution of a metal-organic alkoxide composition to at least one flat surface of an electrically conductive metal strip and heating the coated strip so as to remove the organic component of the metal-organic alkoxide composition and produce a thin, electrically non-conductive metal oxide film on the flat surface. The metal strip with the metal oxide coating is then wound on a spool to form a wound thin film capacitor.Type: GrantFiled: April 19, 1991Date of Patent: August 18, 1992Assignee: Westinghouse Electric Corp.Inventors: Kenneth C. Radford, Stephen R. Gurkovich, Deborah P. Partlow
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Patent number: 5103103Abstract: A switchable shield which precludes transmission or receipt of radio frequency or microwave energy. The shield comprises a substrate of highly transmissive material with an active film layer disposed on the substrate. This active film layer is switchable upon heating from a high transmissivity, high resistivity mode which permits transmission or receipt of rf or microwave radiation, to a low transmissivity, low resistivity mode which precludes transmission or receipt of rf or microwave radiation through the shield.Type: GrantFiled: July 19, 1990Date of Patent: April 7, 1992Assignee: Westinghouse Electric Corp.Inventors: Kenneth C. Radford, Deborah P. Partlow
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Patent number: 4828774Abstract: A porous body consisting of a felted fibrous skeleton covered with and bonded together by a ceramic material is provided. Also provided are methods for making such a porous body which comprise the use of ceramic polymer solutions.Type: GrantFiled: February 5, 1987Date of Patent: May 9, 1989Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Clarence A. Andersson, Deborah P. Partlow, Bulent E. Yoldas