Patents by Inventor Andre Gabry

Andre Gabry 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).

  • Elastic surface wave recursive filter
    Patent number: 4398163
    Abstract: An elastic surface wave recursive filter comprising: at least one delay line formed by two elastic surface wave transducers, such line being looped on itself externally by an amplifier, a means for introducing an elastic surface wave into such line, such means being connected to an input of the filter, and a third transducer having the form of a transversal filter, the transducer being coupled to said line and connected to an output of the filter. The transfer function of the filter is the form P(z)/Q(z), the numerator and the denominator being independant.
    Type: Grant
    Filed: May 13, 1981
    Date of Patent: August 9, 1983
    Assignee: L'Etat Francais
    Inventors: Michel Feldmann, Jeannine Henaff, Andre Gabry