Patents by Inventor Randolph D. Schueller
Randolph D. Schueller 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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Publication number: 20090236129Abstract: A method for processing a printed circuit board (PCB) wherein the method includes providing a substrate in contact with a metal surface, contacting the metal surface with an immersion silver solution thereby producing an immersion silver layer upon the metal surface, and thereafter, providing a solder mask in contact with the metal surface and the immersion silver layer.Type: ApplicationFiled: March 19, 2008Publication date: September 24, 2009Applicant: DELL PRODUCTS L.P.Inventors: Randolph D. Schueller, Thad C. McMillan, JR.
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Patent number: 7140942Abstract: A field emission device having emitter tips and a support layer for a gate electrode is provided. Openings in the support layer and the gate layer are sized to provide mechanical support for the gate electrode. Cavities may be formed and mechanically supported by walls between cavities or columns within a cavity. Dielectric layers having openings of different sizes between the emission tips and the gate electrode can decrease leakage current between emitter tips and the gate layer. The emitter tips may comprise a carbon-based material. The device can be formed using processing operations similar to those used in conventional semiconductor device manufacturing.Type: GrantFiled: August 26, 2005Date of Patent: November 28, 2006Assignee: Altera CorporationInventors: Randolph D. Schueller, Susan Hong, legal representative, Charlie C. Hong, deceased
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Patent number: 6963160Abstract: A field emission device having emitter tips and a support layer for a gate electrode is provided. Openings in the support layer and the gate layer are sized to provide mechanical support for the gate electrode. Cavities may be formed and mechanically supported by walls between cavities or columns within a cavity. Dielectric layers having openings of different sizes between the emission tips and the gate electrode can decrease leakage current between emitter tips and the gate layer. The emitter tips may comprise a carbon-based material. The device can be formed using processing operations similar to those used in conventional semiconductor device manufacturing.Type: GrantFiled: December 26, 2001Date of Patent: November 8, 2005Assignee: Trepton Research Group, Inc.Inventors: Randolph D. Schueller, Susan Hong, legal representative, Charlie C. Hong, deceased
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Patent number: 6911770Abstract: A cap can comprise an aperture, and an attenuator may block the aperture during at least one point in time. In one embodiment, the attenuator can include a cover that may be displaced by a spring. In another embodiment, such as an electron gun, may comprise a support cap with an aperture, a displaceable cover that may cover the aperture, and a spring. A material attached to the spring and acting as a fuse may release the spring and expose the aperture after an electrical current blows the “fuse”. In yet another embodiment, a method for using a tube may comprise evacuating the tube while a cover covers an aperture in the support cap of a electron gun that is at least partially in the tube and moving the cover to expose the aperture after the tube is sealed.Type: GrantFiled: February 1, 2002Date of Patent: June 28, 2005Assignee: Trepton Research Group, Inc.Inventors: Randolph D. Schueller, Duane T. Smith
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Patent number: 6840834Abstract: Apparatus and method are provided for a package structure that enables mounting of a field-emitting cathode into an electron gun. A non-conducting substrate has the cathode attached and the cathode is electrically connected to a pin through the substrate. Other pins are electrically connected to electrodes integral with the cathode. Three cathodes may be mounted on a die flag region to form an electron gun suitable for color CRTs. Accurate alignment of an emitter array to the apertures in the electron gun and other electrodes such as a focusing lens is achieved. The single package design may be used for many gun sizes. Assembly and attachment of the emitter array to the electron gun during construction of the gun can lower cost of construction.Type: GrantFiled: October 11, 2002Date of Patent: January 11, 2005Assignee: Trepton Research Group, Inc.Inventors: Randolph D. Schueller, Kent R. Kalar, Anthony A. Kloba
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Patent number: 6664721Abstract: A field emitter (10) having improved electron emission properties is provided. Electron-emitting microtip protrusions (14) in an emitter layer (12) are separated from a dielectric layer (18) by an interlayer (16) that prevents substantial mixing of the dielectric (16) and the emitter layer (12) during growth of the dielectric layer (18). A conductive gate electrode layer (20) is deposited on the dielectric layer (18). For carbon-based emitters, aluminum is one of several suitable interlayers between the carbon layer and a silicon dioxide dielectric layer.Type: GrantFiled: October 6, 2000Date of Patent: December 16, 2003Assignee: Extreme Devices IncorporatedInventors: Keith D. Jamison, Donald E. Patterson, Charlie Hong, Randolph D. Schueller, David F. Hebert, Richard L. Woodin
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Publication number: 20030146686Abstract: A cap can comprise an aperture, and an attenuator may block the aperture during at least one point in time. In one embodiment, the attenuator can include a cover that may be displaced by a spring. In another embodiment, an electron gun, such as an electron gun, may comprise a support cap with an aperture, a displaceable cover that may cover the aperture, and a spring. A material attached to the spring and acting as a fuse may release the spring and expose the aperture after an electrical current blows the “fuse.” In yet another embodiment, a method for using a tube may comprise evacuating the tube while a cover covers an aperture in the support cap of a electron gun that is at least partially in the tube and moving the cover to expose the aperture after the tube is sealed.Type: ApplicationFiled: February 1, 2002Publication date: August 7, 2003Applicant: Extreme Devices, Inc.Inventors: Randolph D. Schueller, Duane T. Smith
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Publication number: 20030117055Abstract: A field emission device having emitter tips and a support layer for a gate electrode is provided. Openings in the support layer and the gate layer are sized to provide mechanical support for the gate electrode. Cavities may be formed and mechanically supported by walls between cavities or columns within a cavity. Dielectric layers having openings of different sizes between the emission tips and the gate electrode can decrease leakage current between emitter tips and the gate layer. The emitter tips may comprise a carbon-based material. The device can be formed using processing operations similar to those used in conventional semiconductor device manufacturing.Type: ApplicationFiled: December 26, 2001Publication date: June 26, 2003Inventors: Randolph D. Schueller, Charlie C. Hong, Susan Hong
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Publication number: 20030034721Abstract: An array of carbon-based emitters is provided having more uniform electron emission over the area of the array. This is made possible by a resistive layer that is present below each of the emission tips. Both organic and inorganic resistive layers may be grown under the emitting carbon-based material. A conductive backing layer is in contact with the resistive layer. Methods for making the improved array are provided. The methods include growth of carbon-based tips in a mold, removal of various films or portions of films by etching, and other techniques.Type: ApplicationFiled: August 20, 2001Publication date: February 20, 2003Inventors: Henry Windischmann, Randolph D. Schueller, Byron G. Zollars, Keith D. Jamison, Donald E. Patterson, Kent R. Kalar
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Publication number: 20030032362Abstract: Apparatus and method are provided for a package structure that enables mounting of a field-emitting cathode into an electron gun. A non-conducting substrate has the cathode attached and the cathode is electrically connected to a pin through the substrate. Other pins are electrically connected to electrodes integral with the cathode. Three cathodes may be mounted on a die flag region to form an electron gun suitable for color CRTs. Accurate alignment of an emitter array to the apertures in the electron gun and other electrodes such as a focusing lens is achieved. The single package design may be used for many gun sizes. Assembly and attachment of the emitter array to the electron gun during construction of the gun can lower cost of construction.Type: ApplicationFiled: October 11, 2002Publication date: February 13, 2003Inventors: Randolph D. Schueller, Kent R. Kalar, Anthony A. Kloba
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Patent number: 6507118Abstract: A printed circuit assembly includes an interposer circuit having a flexible dielectric core with an array of contact members attached thereto. Each contact member includes a first interconnect surface accessible from a first side of the dielectric core and a second interconnect surface accessible from a second side of the dielectric core. A conductive element is attached to the first interconnect surface of each contact member. A flip chip semiconductor die includes an array of bond pads on a mounting surface thereof. Each bonding pad of the semiconductor die is substantially aligned with a respective one of the first interconnect surfaces of the interposer circuit. Each bonding pad is electrically connected to the corresponding conductive element. The electronic device defines a perimeter edge that circumscribes the array of bonding pads and the array of contact members of the interposer circuit. A solder ball is attached to the second interconnect surface of each contact member.Type: GrantFiled: July 14, 2000Date of Patent: January 14, 2003Assignee: 3M Innovative Properties CompanyInventor: Randolph D. Schueller
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Patent number: 6396141Abstract: A flexible circuit system includes a flexible dielectric layer having a first conductive layer on a first side and a second conductive layer on a second side. A non-conductive, closed end passage extends through the dielectric layer from the first side to the second side. The first conductive layer is adjacent an open end of the passage at the first side, and the second conductive layer forms the closed end of the passage at the second side. A stiffener member is attached to the second conductive layer. A solder ball is connected to provide a conductive path between the first conductive layer and the second conductive layer.Type: GrantFiled: January 4, 2001Date of Patent: May 28, 2002Assignee: 3M Innovative Properties CompanyInventors: Randolph D. Schueller, Donald K. Larson
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Patent number: 6373182Abstract: Apparatus and method for mounting a field emission device having emitters and an extraction grid in an electron gun are provided. The apparatus may be adapted from parts of a conventional electron gun that uses a thermionic emitter. Electrical connection to the grid is provided by bumps that are spring-loaded against a conducting surface, such as the second grid of a conventional electron gun.Type: GrantFiled: March 24, 2000Date of Patent: April 16, 2002Assignee: Extreme Devices, Inc.Inventors: Anthony A. Kloba, Randolph D. Schueller, David A. Delguzzi, Donald E. Patterson, Keith D. Jamison, Kent R. Kalar
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Publication number: 20010020636Abstract: The present invention relates to a method for making an array of metal balls. The method includes the step of generating a first pattern on a metal foil which includes a plurality of foil projections. The method also includes the step of generating a second pattern on a carrier substrate. The second pattern includes a plurality of carrier recesses that are arranged and configured to correspond with the foil projections of the first pattern. The method further includes the steps of placing the metal foil and the carrier substrate together such that the foil projections of the metal foil fit within the carrier recesses of the carrier substrate, and melting the metal foil such that the foil projections form metal balls positioned within the carrier recesses of the carrier substrate. The invention also relates to metal ball arrays constructed via the above method.Type: ApplicationFiled: April 5, 2001Publication date: September 13, 2001Applicant: 3M Innovative Properties CompanyInventors: David C. Koskenmaki, Randolph D. Schueller, Robert P. McCollam
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Publication number: 20010001505Abstract: A flexible circuit system includes a flexible dielectric layer having a first conductive layer on a first side and a second conductive layer on a second side. A non-conductive, closed end passage extends through the dielectric layer from the first side to the second side. The first conductive layer is adjacent an open end of the passage at the first side, and the second conductive layer forms the closed end of the passage at the second side. A stiffener member is attached to the second conductive layer. A solder ball is connected to provide a conductive path between the first conductive layer and the second conductive layer.Type: ApplicationFiled: January 4, 2001Publication date: May 24, 2001Applicant: 3M Innovative Properties CompanyInventors: Randolph D. Schueller, Donald K. Larson
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Patent number: 6000603Abstract: The present invention relates to a method for making an array of metal balls. The method includes the step of generating a first pattern on a metal foil which includes a plurality of foil projections. The method also includes the step of generating a second pattern on a carrier substrate. The second pattern includes a plurality of carrier recesses that are arranged and configured to correspond with the foil projections of the first pattern. The method further includes the steps of placing the metal foil and the carrier substrate together such that the foil projections of the metal foil fit within the carrier recesses of the carrier substrate, and melting the metal foil such that the foil projections form metal balls positioned within the carrier recesses of the carrier substrate. The invention also relates to metal ball arrays constructed via the above method.Type: GrantFiled: May 23, 1997Date of Patent: December 14, 1999Assignee: 3M Innovative Properties CompanyInventors: David C. Koskenmaki, Randolph D. Schueller, Robert P. McCollam
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Patent number: 5866949Abstract: A chip scale ball grid array for integrated circuit packaging having a nonpolymer layer or support structure positioned between a semiconductor die and a substrate. The nonpolymer support structure acts to increase circuit reliability by reducing thermal stress effects and/or by reducing or eliminating formation of voids in an integrated circuit package. A nonpolymer support structure may be a material, such as copper foil, having sufficient rigidity to allow processing of chip scale package in strip format.Type: GrantFiled: October 8, 1997Date of Patent: February 2, 1999Assignee: Minnesota Mining and Manufacturing CompanyInventor: Randolph D. Schueller
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Patent number: 5663530Abstract: A tape ball grid array package reverses the usual attachment of flexible circuitry to a stiffener so that the circuit traces face the stiffener rather than away from the stiffener as is conventional. This construction allows the elimination of a previously necessary solder mask and so reduces the cost to produce the package.Type: GrantFiled: August 1, 1995Date of Patent: September 2, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Randolph D. Schueller, Anthony R. Plepys, Howard E. Evans
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Patent number: 5602422Abstract: A flexible circuit construction includes a polymeric sheet, via holes in the sheet and metal circuitry disposed on the sheet. The circuitry terminates at a cantilever end partially spanning the via hole to which a solder ball is subsequently attached. The cantilever end allows the solder ball to move relative to the flexible circuit and thus compensate for misalignment and-differential thermal expansion effects.Type: GrantFiled: June 16, 1995Date of Patent: February 11, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Randolph D. Schueller, David J. Windschitl
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Patent number: 5585162Abstract: A flexible circuit construction allows solder balls to be mass reflow attached to the ground plane of a double-sided flexible circuit by providing a first via which is separate from the remainder of the ground plane, but which is electrically connected to the ground plane through a second via at a distance from the first via by a circuit trace on the side of the flexible circuit opposite the ground plane.Type: GrantFiled: June 16, 1995Date of Patent: December 17, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventor: Randolph D. Schueller