Patents by Inventor Alain Jacobelli

Alain Jacobelli 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).

  • Patent number: 5013394
    Abstract: The invention concerns a method for the detection of the end of grinding of at least one thin layer magnetic head, the head comprising, at the stage of implementation of said method, an active face, formed by two magnetic poles (1, 2) separated by a gap (4). The method comprises the following steps:deposition of a conductive layer (7) on the entire active face (3)etching of the active face coated with said conductive layer;deposition of a layer of dielectric material (8) on the etched active face;grinding of the active face starting from the face that is free of the layer of dielectric material (8) until total removal of that part of the conductive layer (7) located above the gap (4), this removal being detected by the sudden variation in resistivity between the two magnetic poles (1, 2).
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: May 7, 1991
    Assignee: Compagnie Europeenne de Composants Electroniques LCC
    Inventors: Jean-Luc Rolland, Jean-Yves Beguin, Henriette Magna, Alain Jacobelli, Maurice Penot
  • Patent number: 4939835
    Abstract: A method for achieving the planar surface of an active face for magnetic recording/reading heads. The planar surface of the active face is obtained by grinding, the active face being of the type where, before the grinding operation, the level of the material forming the gap is recessed with respect to the magnetic poles, the method comprising depositing over the recess a thin layer of non-magnetic material with a thickness at least equal to the recess of the gap. The non-magnetive thin layer may then be ground to obtain the planar surface of the active face.
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: July 10, 1990
    Assignee: Compagnis Europeenne de Composants Electroniques
    Inventors: Jean-Marc Coutellier, Alain Jacobelli, Henriette Magna, Paul-Louis Meunier
  • Patent number: 4697145
    Abstract: A process and apparatus for measuring a magnetic field based on the Faraday effect rotation of a light beam passing through a ferrimagnetic coating subject to a magnetic field to be measured is shown. The magnetization direction within the ferrimagnetic coating is coherently oriented by applying a high amplitude alternating magnetic field oriented in accordance with the axis of the light beam. This is followed by a progressive reduction of the amplitude of this magnetic field and the magnetic field to be measured is compensated. A system and a measuring cell making it possible to perform said process is also shown.
    Type: Grant
    Filed: January 24, 1985
    Date of Patent: September 29, 1987
    Assignee: Thomson-CSF
    Inventors: Gerard Doriath, Pierre Hartemann, Alain Jacobelli
  • Patent number: 4515016
    Abstract: An elastic surface wave accelerometer having a deformable structure, fixed at one end and providing at its free end a seismic mass. The deformable structure may be an open frame with a single post or a closed frame with two posts. The accelerometer can measure movement of a missile or that of a gravitational field.
    Type: Grant
    Filed: June 17, 1983
    Date of Patent: May 7, 1985
    Assignee: Thomson-CSF
    Inventors: Pierre Hartemann, Paul-Louis Meunier, Alain Jacobelli