Patents by Inventor Frank J. Schnettler

Frank J. Schnettler 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).

  • Bubble device containing a ferrite biasing magnet
    Patent number: 4207613
    Abstract: A ferrite material has been found that is useful for a biasing magnet whose magnetic field stabilizes single wall magnetic domains. The strong temperature dependence of the ferrite's magnetic field makes the ferrite especially useful when used with magnetic materials which require a highly temperature dependent magnetic field to maintain a constant domain or bubble size. The ferrite composition is represented by the formula NiFe.sub.(1+x) Cr.sub.(1-x) O.sub.4, x is in the range between 0.04 and 0.18, and 1 percent to 10 percent, by weight, additional material selected from the group consisting of zirconium oxide, thorium oxide and hafnium oxide.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: June 10, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Ernst M. Gyorgy, Frank J. Schnettler