Patents by Inventor Pierre Duruisseaud

Pierre Duruisseaud 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).

  • Method and apparatus for exploring earth and rocky formations
    Patent number: 4458245
    Abstract: The length and width of fissures in a bore hole is determined by alternately flowing liquid into and out of the formation from an isolated zone of a bore hole, at different frequencies, and measuring the dynamic pressure of the flowing fluid. The length of fissures in the isolated zone is determined from frequency peaks at high pressure to flow ratios, and the thickness of the fissures is determined from variations of pressure-flow ratios with frequency by comparison with known data. Sonde apparatus for practicing the method is also disclosed.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: July 3, 1984
    Assignee: Agence Nationale de Valorisation de la Recherche (ANVAR)
    Inventors: Bernard Crosnier, Pierre Duruisseaud, Gilles Fras, Paul Jouanna, Jean-Luc Portales