Patents by Inventor Claude Lardat

Claude Lardat 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 of manufacturing a surface wave dispersive filter and a filter manufactured in accordance with this method
    Patent number: 4857870
    Abstract: The invention provides a method of producing surface wave dispersive filters of RAC type, in which, in an RAC of known type, one of the input or output transducers is replaced by a transducer forming a surface wave filter and whose transfer function allows the errors of the initial transfer function of the RAC to be corrected.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: August 15, 1989
    Assignee: Thomson-CSF
    Inventors: Herve Gautier, Claude Lardat
  • Surface wave dispersive acoustic delay line
    Patent number: 4477784
    Abstract: A dispersive acoustic delay line using reflection on slanted gratings is provided. This device comprises slanting input and output transducers each formed of pair electrode fingers. The interval of the electrodes of different polarity varying from nv/2f.sub.min to nv/2f.sub.max, where v is the speed of the waves, f.sub.min and f.sub.max the endmost frequencies of the frequency band and n the number of the harmonic on which the transducers operate. The interval of the gratings varies from kv/f.sub.min to kv/f.sub.max, where k is the number of the operating harmonic of the network, with n.noteq.k.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: October 16, 1984
    Assignee: Thomson-CSF
    Inventors: Charles Maerfeld, Claude Lardat