Patents by Inventor Annick Romann

Annick Romann 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).

  • Process for the manufacture of thick layer varistors on a hybrid circuit substrate
    Patent number: 4460624
    Abstract: The invention relates to a process for the manufacture of non-linear resistors (varistors) from thick-layer ceramic material, in particular on a hybrid circuit substrate, or any other device requiring that a predetermined temperature should not be exceeded during its manufacture.According to the invention, after crushing a ceramic material in order to obtain a very fine powder of varistor material, a powder is produced of conductive or semiconductive material able to assume the pasty state at a temperature lower than 850.degree. C. and a binder is incorporated therein to obtain a screen printing paste. The layer deposited by screen printing on a substrate such as glass, is dried and then heat treated so as to assure cohesion of the layer. This layer is either inserted between a previously deposited electrode and another electrode, or covered by two separate electrodes. The invention is particularly applicable to matrix access display screens.
    Type: Grant
    Filed: August 31, 1982
    Date of Patent: July 17, 1984
    Assignee: Thomson-CSF
    Inventors: Michel Graciet, Annick Romann, Francois Buchy