Patents by Inventor Nathaniel D. Darnall

Nathaniel D. Darnall 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).

  • Rail shear tester apparatus with multiple loading configurations
    Patent number: 9377384
    Abstract: An apparatus for testing panel products in edgewise shear in which the shear stress is applied in a diagonal direction with a first rotational degree of freedom in a first grip means and a second rotational degree of freedom in a second grip means as a first loading configuration. A second loading configuration is provided in which the second rotational degree of freedom of the second grip means is locked in place and motion is prevented. A third preferred method of loading is available in which shear forces in a horizontal direction through a centerline of a specimen, with the centerline in the plane of the specimen and extending across a widest dimension of said specimen. Control and data collection are under computer control and operator safety is enhanced by a locking guard door which is electrically locked while the various parts of the machine are in motion.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: June 28, 2016
    Assignee: METRIGUARD INC
    Inventors: James D. Logan, Dean A. Nelson, Nathaniel D. Darnall, Timothy T. Meekhof, Peter A. Siebold, Ryan D. Baldwin, David E. Abbott, Wayne P. Waldher
  • Rail Shear Tester Apparatus with multiple loading configurations
    Publication number: 20150316458
    Abstract: An apparatus for testing panel products in edgewise shear in which the shear stress is applied in a diagonal direction with a first rotational degree of freedom in a first grip means and a second rotational degree of freedom in a second grip means as a first loading configuration. A second loading configuration is provided in which the second rotational degree of freedom of the second grip means is locked in place and motion is prevented. A third preferred method of loading is available in which shear forces in a horizontal direction through a centerline of a specimen, with the centerline in the plane of the specimen and extending across a widest dimension of said specimen. Control and data collection are under computer control and operator safety is enhanced by a locking guard door which is electrically locked while the various parts of the machine are in motion.
    Type: Application
    Filed: April 22, 2015
    Publication date: November 5, 2015
    Applicant: METRIGUARD INC
    Inventors: James D. Logan, Dean A. Nelson, Nathaniel D. Darnall, Timothy T. Meekhof, Peter A. Siebold, Ryan D. Baldwin, David E. Abbott, Wayne P. Waldher