Patents by Inventor Mohammad A. Alim

Mohammad A. Alim 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).

  • Rare earth doped zinc oxide varistors
    Patent number: 5854586
    Abstract: A varistor includes a Bi-free, essentially homogeneous sintered body of a ceramic composition including, expressed as nominal weight %, 0.2-4.0% oxide of at least one rare earth element, 0.5-4.0% Co.sub.3 O.sub.4, 0.05-0.4% K.sub.2 O, 0.05-0.2% Cr.sub.2 O.sub.3, 0-0.2% CaO, 0.00005-0.01% Al.sub.2 O.sub.3, 0-2% MnO, 0-0.05% MgO, 0-0.5% TiO.sub.3, 0-0.2% SnO.sub.2, 0-0.02% B.sub.2 O.sub.3, balance ZnO.
    Type: Grant
    Filed: September 17, 1997
    Date of Patent: December 29, 1998
    Assignee: Lockheed Martin Energy Research Corporation
    Inventors: April D. McMillan, Frank A. Modine, Robert J. Lauf, Mohammad A. Alim, Gerald D. Mahan, Miroslaw Bartkowiak
  • Method for making metal oxide varistors coated with passivating coating
    Patent number: 5387432
    Abstract: There is disclosed a passivating coating composition suitable for application as a collar to metal oxide varistor valve block cylindrical surfaces comprising a mixture of 64-74 parts by weight of a glass powder, 22-35 parts by weight of water, and 0.5-2 parts by weight of an additive comprising fumed silica, clay and urea.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: February 7, 1995
    Assignee: Hubbell Incorporated
    Inventors: Mohammad A. Alim, Karen C. Beal
  • Passivating coating for metal oxide varistors
    Patent number: 5366935
    Abstract: There is disclosed a passivating coating composition suitable for application as a collar to metal oxide varistor valve block cylindrical surfaces comprising a mixture of 64-74 parts by weight of a glass powder, 22-35 parts by weight of water, and 0.5-2 parts by weight of an additive comprising fumed silica, clay and urea.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: November 22, 1994
    Assignee: Hubbell Incorporated
    Inventors: Mohammad A. Alim, Karen C. Beal
  • Passivating coating for metal oxide varistors
    Patent number: 5307046
    Abstract: It is disclosed that the properties of a ceramic mullite-kaolinite based passivating coating composition applied as a collar to metal oxide varistor valve block cylindrical surfaces are improved by including in the coating composition from 0.03 to 15% by weight of the coating composition one or more of the following additive compounds: TiO.sub.2 ; Y.sub.2 O.sub.3 ; ZrO.sub.2 ; ZnO; Boroflux (2ZNO.sup.. 3B.sub.2 O.sub.3.sup.. 7H.sub.2 O; or 3ZnO.sup.. 2B.sub.2 O.sub.3.sup.. 5H.sub.2 O); or Si.sub.3 N.sub.4. The coating composition comprises by dry weight a mixture of 55-85% mullite and 15-45% kaolinite, one or a mixture of the above additive compounds, and sufficient water to form a sprayable slurry. The inclusion of the additive compound results in enhanced contact adhesion between the collar and the metal oxide varistor peripheral surface.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: April 26, 1994
    Assignee: Hubbell Incorporated
    Inventor: Mohammad A. Alim