Patents by Inventor Roy C. LeCraw

Roy C. LeCraw 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).

  • Devices depending on garnet materials
    Patent number: 4354254
    Abstract: Devices based on epitaxial garnet layers that exhibit a high magnetic anisotropy are disclosed. These garnet layers are produced by introducing a Co.sup.2+ or a species with 1, 2, 4, or 5 electrons in a 4d or a 5d electron orbital in the octahedral site of the garnet in conjunction with a typical anisotropy producing combination on the dodecahedral site. The contribution to magnetic anisotropy due to the typical combination on the dodecahedral site and the appropriate ion in an octahedral site is complementary.
    Type: Grant
    Filed: November 7, 1980
    Date of Patent: October 12, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Stuart L. Blank, Ernst M. Gyorgy, Roy C. LeCraw, Lars C. Luther
  • Advantageous garnet based devices
    Patent number: 4337521
    Abstract: Devices based on epitaxial garnet layers which exhibit a substantial contribution to the magnetic anisotropy other than that attributable to the presence of magnetic rare earth ions are disclosed. These garnet layers are produced by introducing Co.sup.2+ or a species with 1, 2, 4, or 5 electrons in a 4d or 5d electronic orbital in the octahedral site of the garnet. It is possible to produce epitaxial garnets having low damping constants, as determined by resonance line widths on the order of 100 Oe, and K.sub.u 's on the order of 300,000 ergs/cm.sup.3.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: June 29, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Stuart L. Blank, Ernst M. Gyorgy, Roy C. LeCraw, Lars C. Luther
  • Process for suppressing hard bubbles in magnetic bubble devices
    Patent number: 4171389
    Abstract: A method is disclosed for suppressing hard bubbles in epitaxial magnetic garnet films. The method comprises annealing in an essentially inert atmosphere and renders the annealed film incapable of sustaining hard bubbles.
    Type: Grant
    Filed: July 6, 1976
    Date of Patent: October 16, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Ernst M. Gyorgy, Roy C. LeCraw, Raymond Wolfe
  • Magnetic devices utilizing garnet epitaxial materials
    Patent number: 4139905
    Abstract: Members of a class of garnet compositions of particular crystallographic orientation are usefully incorporated in magnetic memory devices which depend for their operation on the positioning of single wall domains ("bubbles"). Such compositions, ordinarily in the form of a supported layer defining a (110) orientation, manifest high limiting bubble velocity, thereby making possible high record and retrieval rates. Compositions invariably contain some lanthanum in the dodecahedral site. Increased limiting velocity is attributed to in-plane anisotropy, in turn, dependent upon partial lanthanum occupation. Depending upon composition, required unique easy direction out of the plane may be as-grown, stress induced, or a combination. Appropriate garnet substrates of required lattice parameters are described.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: February 13, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Stuart L. Blank, Roy C. LeCraw, Raymond Wolfe