Patents by Inventor Lewis C. Hoffman

Lewis C. Hoffman 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).

  • Sealing glass composite
    Patent number: 4818730
    Abstract: The present direct invention is directed to a sealing glass composite comprising a low melting point sealing glass matrix mixed with a particulate additive to increase the effective coefficient of thermal expansion of the resulting sealing glass composite. The sealing glass matrix is in the lead borate family and the particulate additive is preferably calcium fluoride. For extreme bonding conditions, a small amount of copper oxide is dissolved into the glass matrix.
    Type: Grant
    Filed: March 17, 1987
    Date of Patent: April 4, 1989
    Assignee: Olin Corporation
    Inventors: Edward F. Smith, III, Lewis C. Hoffman
  • Sealing glass composite
    Patent number: 4752521
    Abstract: The present direct invention is directed to a sealing glass composite comprising a low melting point sealing glass matrix mixed with a particulate additive to increase the effective coefficient of thermal expansion of the resulting sealing glass composite. The sealing glass matrix is in the lead borate family and the particulate additive is preferably calcium fluoride. For extreme bonding conditions, a small amount of copper oxide is dissolved into the glass matrix.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: June 21, 1988
    Assignee: Olin Corporation
    Inventors: Edward F. Smith, III, Lewis C. Hoffman
  • Stable pyrochlore resistor compositions
    Patent number: 4302362
    Abstract: Thick film resistors, based on pyrochlore conductive phase, glass, and refractory fillers having a thermal expansion coefficient range of 40.times.10.sup.-7 -60.times.10.sup.-7 /.degree. C. and low solubility in the glass, are provided. Such thick film resistor pastes afford resistors having excellent stability to mechanical or thermal stresses.
    Type: Grant
    Filed: January 23, 1979
    Date of Patent: November 24, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Lewis C. Hoffman, Samuel J. Horowitz