Patents by Inventor Rene Perret

Rene Perret 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).

  • Wall covering for absorbing sound waves in a liquid medium
    Patent number: 4817757
    Abstract: The covering is immersed in water (2). A viscoelastic substance (4) is disposed in ducts formed by rigid auxiliary walls (5) fixed to the base wall (1). The ends of these ducts (6) contain air. The invention is applicable, in particular, to providing protection against under-sea noise.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: April 4, 1989
    Assignees: Alsthom, Vibrachoc
    Inventors: Rene Perret, Etienne Rouget de Gourcez
  • Sound absorbing wall lining
    Patent number: 4560028
    Abstract: In sound absorbing lining, conduits (4) are provided, filled with a viscous damping fluid, and are in contact by their ends facing towards the rigid supporting wall (1) to which the lining is applied with flexible cells containing a gas and forming a readily compressible material, for example foam rubber (6). Said conduits are separated from the ambient medium (2) by a separating membrane (3) which is permeable to acoustic waves. Lining is applied to absorbing acoustic waves underwater.
    Type: Grant
    Filed: April 8, 1985
    Date of Patent: December 24, 1985
    Assignee: Alsthom-Atlantique
    Inventor: Rene Perret