Patents by Inventor John R. Dennis

John R. Dennis 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).

  • Acoustic well-logging transmitting and receiving transducers
    Patent number: 4319345
    Abstract: An acoustic well-logging transmitting transducer employing a transmitter portion comprising stacked piezoceramic rings and a resonating metallic plate, the dimension of which determines the frequency, and a conical acoustic reflector for causing reflections to impinge omnidirectionally on the wall of the borehole at an angle to enhance shear wave component propagation. A receiving portion of similar construction can also be employed.
    Type: Grant
    Filed: May 23, 1980
    Date of Patent: March 9, 1982
    Assignee: Halliburton Company
    Inventor: John R. Dennis
  • Chimney fire detector
    Patent number: 4315256
    Abstract: A chimney fire detector has a pair of entwined conductors mounted at the outlet of the chimney. A sensing device can detect electrical contact between these conductors. An insulating spacer is mounted between these conductors for separating them. This spacer is formed of material which allows the conductors to pass through the material and touch in response to temperatures in excess of a predetermined magnitude. This predetermined magnitude corresponds to the temperature at the outlet of the chimney during a chimney fire.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: February 9, 1982
    Inventor: John R. Dennis
  • System and method for determining fluid level in a container
    Patent number: 4248087
    Abstract: Methods and systems employing acoustic techniques are disclosed for determining the level of fluid in a container. Flexural mode acoustic waves are set up in the walls of the container. The change in travel time of flexural mode acoustic waves are measured and calibrated in terms of the level of fluid in the container. Systems for continuously monitoring fluid level or indicating when fluid level reaches a predetermined horizontal level are disclosed.
    Type: Grant
    Filed: August 16, 1979
    Date of Patent: February 3, 1981
    Assignee: Halliburton Company
    Inventors: John R. Dennis, Harold D. Fish