Patents Assigned to RO Associates
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Patent number: 7275348Abstract: A precast, prestressed concrete truss which spans between exterior columns and forms an interior or exterior load bearing wall of a building. The truss includes top and bottom chords interconnected by at least one web member. Prestressed reinforcing members in the top and bottom chords apply a compressive stress in the chords. The top and bottom chords are configured to support concrete planks that form a floor and/or a ceiling of a building in which the truss is used. When used as an interior load bearing wall, the truss can include at least one opening that forms, for example, a corridor passage large enough for a person to walk through the opening. When used as an exterior load bearing wall, the truss can include at least one window opening.Type: GrantFiled: October 19, 2005Date of Patent: October 2, 2007Assignee: Ericksen Roed & AssociatesInventor: Michael A. Desutter
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Patent number: 7010890Abstract: A precast, prestressed concrete truss which spans between exterior columns and forms an interior or exterior load bearing wall of a building. The truss includes top and bottom chords interconnected by at least one web member. Prestressed reinforcing members in the top and bottom chords apply a compressive stress in the chords. The top and bottom chords are configured to support concrete planks that form a floor and/or a ceiling of a building in which the truss is used. When used as an interior load bearing wall, the truss can include at least one opening that forms, for example, a corridor passage large enough for a person to walk through the opening. When used as an exterior load bearing wall, the truss can include at least one window opening.Type: GrantFiled: February 6, 2003Date of Patent: March 14, 2006Assignee: Ericksen Roed & Associates, Inc.Inventor: Michael A. DeSutter
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Patent number: 6134129Abstract: An improved current sharing signal coupling/decoupling circuit for use in each module of a system including a plurality of parallel connected modules, each such circuit providing an interface between a module's "current sharing signal" port and a common connection bus. The signal coupling/decoupling circuits also share a common ground noted in the disclosure as a "current sharing reference". Each circuit is comprised of a variable reference based decoupling subcircuit, including a first comparator, a bi-directional switch, and a variable voltage reference, and a fixed referenced based decoupling circuit including a second comparator, a scalar resistor and a fixed voltage reference. The variable reference comparator senses the difference between the variable reference voltage and the voltage on the associated module's current sharing signal port, and activates the bi-directional switch to disconnect the module.Type: GrantFiled: April 1, 1999Date of Patent: October 17, 2000Assignee: RO AssociatesInventor: Steven J. Keller
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Patent number: 5428523Abstract: An improved current sharing signal coupling/decoupling circuit for power converter systems, including the provision of an individual current sharing signal coupling/decoupling circuit for each module of a number of parallel connected modules, each circuit providing an interface between a module's "current sharing signal" port and a common connection bus. The signal coupling/decoupling circuits also share a common ground noted in the disclosure as "current sharing signal ground". The signal coupling/decoupling circuit includes a comparator, a bi-directional switch and a variable voltage reference. The comparator senses the difference between the voltage on the common connection bus, the "common current sharing signal," less an amount set by the variable voltage reference circuit, and the voltage on the module current sharing signal port, the "module current sharing signal".Type: GrantFiled: March 30, 1993Date of Patent: June 27, 1995Assignee: RO AssociatesInventor: John E. McDonnal
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Patent number: 5075821Abstract: An improved DC to DC converter apparatus including a metal-backed PC board which serves as the base plate of the device and has the principal power consuming components affixed thereto, and a conventional circuit board having the relatively lower power consuming electronic components affixed to it, the latter board being secured in closely spaced relationship to the metal-backed board using connecting elements which provide both electrical and thermal interconnection between the two boards. All device connect pins extend from the conventional board, and the entire device is potted in a thermally conductive potting material.Type: GrantFiled: November 5, 1990Date of Patent: December 24, 1991Assignee: RO AssociatesInventor: John E. McDonnal
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Patent number: 4858052Abstract: An improved method and means for protecting converter circuitry during input overvoltage and all load conditions includes a control circuit which reduces duty cycle below requisite conduction time for effective signal conversion with resulting reduction in load current.Type: GrantFiled: April 4, 1988Date of Patent: August 15, 1989Assignee: RO AssociatesInventor: John E. McDonnal
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Patent number: D334171Type: GrantFiled: December 31, 1991Date of Patent: March 23, 1993Assignee: Ro AssociatesInventor: John E. McDonnal