Patents by Inventor Christian Combettes

Christian Combettes 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 magnetically characterizing the recording layer of a magnetic information carrier, and apparatus for performing the method
    Patent number: 4978916
    Abstract: A method and an apparatus are disclosed for determining or defining a magnetic information carrier (TAMB) which includes a plurality of tracks P each having a synchronization index (IND). In the method, (1) the synchronization index (IND) is located, which makes it possible to initialize (pulse I.sub.N) the sequence (SEQ.sub.1, SEQ.sub.2, . . . ) of the following successive operations, which are repeatable p times; (2) the entire surface of the track is first erased; (3) next, on this same surface, a succession of magnetic domains (A.sub.i, A.sub.i+1, A.sub.i+2, . . . ) is written; (4) at predetermined sampling times (t.sub.n, t.sub.n+1. . . ), with a predetermined sampling period T.sub.E, a signal S is read, which is a function of the magnetization inside each of the domains read at these times; and (5) the values of the current I and signal S are memorized.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: December 18, 1990
    Assignee: Bull S.A.
    Inventors: Christian Combettes, Rene Lefebvre