Patents by Inventor Henri Louit

Henri Louit 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 for measuring the pre-stress in hoop-bound anuluses of rectangular cross-section and made of piezoelectric ceramic material
    Patent number: 4099407
    Abstract: A static stress and a sinusoidal dynamic stress are applied to the internal urface of the anulus. The electric voltage between the internal surface and the external surface of the anulus is measured for each value of the static stress. The static stress at which the sinusoidal voltage is maximum corresponds to the pre-stress due to the binding.
    Type: Grant
    Filed: May 19, 1977
    Date of Patent: July 11, 1978
    Assignee: Compagnie Industrielle des Telecommunications Cit-Alcatel S.A.
    Inventor: Henri Louit