Patents by Inventor Robert C. Caldwell

Robert C. Caldwell 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).

  • Patent number: 6830159
    Abstract: A file cabinet providing access to files from substantially all sides, and having one or more rotatable tiers, each tier containing a plurality of file containers. Each tier includes a central carrousel support having a plurality of radially extending arms. Mounted to the outer terminus of each arm is a file support assembly, each configured to rotate about a vertical axis between a retracted position and an extended position. Each file support assembly is adapted to suspend a file container thereon to provide detachable storage. The detachable file containers each include a box having an upper frame which suspends the container from the file support assemblies. A top may provided to close each container in a secure manner to protect the container's contents.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: December 14, 2004
    Assignee: Harbor Steel & Supply Corp.
    Inventors: Robert C. Caldwell, Jr., Charles B. Carter, David Kersjes, Gardner Klaasen, II
  • Patent number: 6588865
    Abstract: A file cabinet providing access to files from substantially all sides, and having one or more rotatable tiers, each tier containing a plurality of file containers. Each tier includes a central carrousel support having a plurality of radially extending arms. Mounted to the outer terminus of each arm is a file support assembly, each configured to rotate about a vertical axis between a retracted position and an extended position. Each file support assembly is adapted to suspend a file container thereon to provide detachable storage. The detachable file containers each include a box having an upper frame which suspends the container from the file support assemblies. A top may provided to close each container in a secure manner to protect the container's contents.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: July 8, 2003
    Assignee: Harbor Steel & Supply Corporation
    Inventors: Robert C. Caldwell, Jr., Charles B. Carter, David Kersjes, Gardner Klaasen, II, David Swenson
  • Publication number: 20030038569
    Abstract: A file cabinet providing access to files from substantially all sides, and having one or more rotatable tiers, each tier containing a plurality of file containers. Each tier includes a central carrousel support having a plurality of radially extending arms. Mounted to the outer terminus of each arm is a file support assembly, each configured to rotate about a vertical axis between a retracted position and an extended position. Each file support assembly is adapted to suspend a file container thereon to provide detachable storage. The detachable file containers each include a box having an upper frame which suspends the container from the file support assemblies. A top may provided to close each container in a secure manner to protect the container's contents.
    Type: Application
    Filed: August 20, 2002
    Publication date: February 27, 2003
    Inventors: Robert C. Caldwell, Charles B. Carter, David Kersjes, Gardner Klaasen
  • Patent number: 6419332
    Abstract: A file cabinet providing access to files from substantially all sides, and having one or more rotatable tiers, each tier containing a plurality of file containers. Each tier includes a central support wherein at least one radial support arm is rotatably mounted thereto to rotate about the central support. Mounted to the terminus of each radial support arm is a file support, each configured to rotate about a vertical axis between a retracted position toward the interior of the tier, and an extended position. Each file support is adapted to receive a file container suspended thereon to provide detachable storage. Tiers may be added by attaching additional central supports in tandem.
    Type: Grant
    Filed: February 21, 2000
    Date of Patent: July 16, 2002
    Assignee: Harbor Steel & Supply Corp.
    Inventors: Robert C. Caldwell, Jr., Charles B. Carter, David Kersjes, Gardner Klaasen, II
  • Publication number: 20010017508
    Abstract: A file cabinet providing access to files from substantially all sides, and having one or more rotatable tiers, each tier containing a plurality of file containers. Each tier includes a central carrousel support having a plurality of radially extending arms. Mounted to the outer terminus of each arm is a file support assembly, each configured to rotate about a vertical axis between a retracted position and an extended position. Each file support assembly is adapted to suspend a file container thereon to provide detachable storage. The detachable file containers each include a box having an upper frame which suspends the container from the file support assemblies. A top may provided to close each container in a secure manner to protect the container's contents.
    Type: Application
    Filed: March 15, 2001
    Publication date: August 30, 2001
    Inventors: Robert C. Caldwell, Charles B. Carter, David Kersjes, Gardner Klaasen, David Swenson
  • Patent number: 5806301
    Abstract: Pressure sensors are placed at axial locations in the isolator of a scramjet or ramjet. An engine fuel control produces calculated pressure values for the those locations from a stored function. As the engine operates, the pressure signals from the pressure sensors are compared with those pressure values for each sensor location and the stored function is adjusted so that the curve of the calculated pressures closely matches the measured pressures within stored upper and lower pressure limits for each pressure sensor location. From the adjusted function. the shock system is located. Fuel flow is controlled to maintain the shock system at a desired location in the isolator. Faulty pressure sensors are detected from a signal that manifests the difference between calculated and actual pressure at each pressure sensor.
    Type: Grant
    Filed: December 11, 1995
    Date of Patent: September 15, 1998
    Assignee: United Technologies Corporation
    Inventors: Mark D. auBuchon, Robert C. Caldwell, James T. Gill, III, Joseph P. Madden