Patents by Inventor Donald Edgar Rasmussen

Donald Edgar Rasmussen 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: 4091990
    Abstract: The deflection of a subterranean tunnel is measured with a rod-like, self-contained instrument that is adapted to be inserted into a radially extending bore of the tunnel adjacent an end of the tunnel where the tunnel is being dug. One end of the instrument is anchored at the end of the bore remote from the tunnel wall, while the other end of the intrument is anchored adjacent the end of the wall in proximity to the tunnel wall. The two ends of the instrument are linearly displaceable relative to each other; the displacement is measured by a transducer means mounted on the instrument. Included in the instrument is a data storage means including a paper tape recorder periodically responsive to a parallel binary signal indicative of the measured displacement.
    Type: Grant
    Filed: August 2, 1976
    Date of Patent: May 30, 1978
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Donald Edgar Rasmussen, Peter John Hof, Jr.
  • Patent number: 3987667
    Abstract: The deflection of a subterranean tunnel is measured with a rod-like, self-contained instrument that is adapted to be inserted into a radially extending bore of the tunnel adjacent an end of the tunnel where the tunnel is being dug. One end of the instrument is anchored at the end of the bore remote from the tunnel wall, while the other end of the instrument is anchored adjacent the end of the wall in proximity to the tunnel wall. The two ends of the instrument are linearly displaceable relative to each other; the displacement is measured by a transducer means mounted on the instrument. Included in the instrument is a data storage means including a paper tape recorder periodically responsive to a parallel binary signal indicative of the measured displacement. In response to an operator command, a visual indicator including a pair of different colored light emitting diodes, at a face of the rod adjacent the tunnel wall, is responsive to a serial binary signal indicative of the measured displacement.
    Type: Grant
    Filed: June 9, 1975
    Date of Patent: October 26, 1976
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Donald Edgar Rasmussen, Peter John Hof, Jr.