Patents by Inventor Abdelkrim Khelif

Abdelkrim Khelif 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).

  • Absorbent acoustic metamaterial
    Patent number: 11081095
    Abstract: Some embodiments are directed to an elementary acoustic metamaterial cell, including a body made of solid material and at least one resonator defining a groove of width l and depth p, the groove being open on the surface of the body, wherein the depth p is set by a resonant frequency (f) of the cell according to a relationship x, c being the speed of sound in air and the width l is set by an energy density confined in the cell according to a logarithmic relationship Emax ?log (l) determined experimentally, the groove having an acoustic absorption controlled by a ratio between the depth p and the width l of the groove. Some embodiments are also directed to an acoustic screen including such an elementary cell.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: August 3, 2021
    Assignees: UNIVERSITÉ DE FRANCHE-COMTÉ, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Abdelkrim Khelif, Mahmoud Addouche, Aliyasin El Ayouch
  • ABSORBENT ACOUSTIC METAMATERIAL
    Publication number: 20180357994
    Abstract: Some embodiments are directed to an elementary acoustic metamaterial cell, including a body made of solid material and at least one resonator defining a groove of width 1 and depth p, the groove being open on the surface of the body, wherein the depth p is set by a resonant frequency (f) of the cell according to a relationship x, c being the speed of sound in air and the width 1 is set by an energy density confined in the cell according to a logarithmic relationship Emax ? log (1) determined experimentally, the groove having an acoustic absorption controlled by a ratio between the depth p and the width 1 of the groove. Some embodiments are also directed to an acoustic screen including such an elementary cell.
    Type: Application
    Filed: December 2, 2016
    Publication date: December 13, 2018
    Inventors: Abdelkrim KHELIF, Mahmoud ADDOUCHE, Aliyasin EL AYOUCH
  • High-frequency acoustic wave device
    Patent number: 8138856
    Abstract: An acoustic wave device comprising a piezoelectric layer on an omnidirectional acoustic mirror and excitation and/or reception means on a surface of said piezoelectric layer, capable of exciting waves in a band gap of the acoustic mirror.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: March 20, 2012
    Assignees: Centre National de la Recherche Scientifique, Universite de Franche Comte
    Inventors: Abdelkrim Khelif, Abdelkrim Choujaa, Vincent Laude
  • HIGH-FREQUENCY ACOUSTIC WAVE DEVICE
    Publication number: 20110133859
    Abstract: An acoustic wave device comprising a piezoelectric layer on an omnidirectional acoustic mirror and excitation and/or reception means on a surface of said piezoelectric layer, capable of exciting waves in a band gap of the acoustic mirror.
    Type: Application
    Filed: January 28, 2011
    Publication date: June 9, 2011
    Applicants: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, UNIVERSITE DE FRANCHE COMTE
    Inventors: Abdelkrim KHELIF, Abdelkrim CHOUJAA, Vincent LAUDE
  • High-frequency acoustic wave device
    Patent number: 7880563
    Abstract: An acoustic wave device comprising a piezoelectric layer on an omnidirectional acoustic mirror and excitation and/or reception means on a surface of said piezoelectric layer, capable of exciting waves in a band gap of the acoustic mirror.
    Type: Grant
    Filed: February 16, 2006
    Date of Patent: February 1, 2011
    Assignees: Centre National de la Recherche Scientifique, Universite de Franche Comte
    Inventors: Abdelkrim Khelif, Abdelkrim Choujaa, Vincent Laude
  • High-Frequency Acoustic Wave Device
    Publication number: 20080211602
    Abstract: An acoustic wave device comprising a piezoelectric layer on an omnidirectional acoustic mirror and excitation and/or reception means on a surface of said piezoelectric layer, capable of exciting waves in a band gap of the acoustic mirror.
    Type: Application
    Filed: February 16, 2006
    Publication date: September 4, 2008
    Inventors: Abdelkrim Khelif, Abdelkrim Choujaa, Vincent Laude