Patents by Inventor Lee Kammerdiner

Lee Kammerdiner 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).

  • Patent number: 5969935
    Abstract: A lead zirconate titanate ferroelectric film used as the dielectric layer in a ferroelectric capacitor is doped with calcium and/or strontium, and the lead composition selected to improve data retention performance. The chemical formula for the ferroelectric film is: (Pb.sub.v Ca.sub.w Sr.sub.x La.sub.y)(Zr.sub.z Ti.sub.(1-z))O.sub.3 ; wherein v is ideally between 0.9 and 1.3; w is ideally between 0 and 0.1; x is ideally between 0 and 0.1; y is ideally between 0 and 0.1, and z is ideally between 0 and 0.9. In addition, the chemical composition of the ferroelectric film is further specified in that the measured opposite state charge at a specific time and temperature of the ferroelectric capacitor is greater than eight micro-Coulombs per square centimeter, and the rate of imprint degradation is less than fifteen percent per decade.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: October 19, 1999
    Assignee: Ramtron International Corporation
    Inventors: Lee Kammerdiner, Tom Davenport, Domokos Hadnagy
  • Patent number: 5800683
    Abstract: A lead zirconate titanate ferroelectric film used as the dielectric layer in a ferroelectric capacitor is doped with calcium and/or strontium, and the lead composition selected to improve data retention performance. The chemical formula for the ferroelectric film is: (Pb.sub.v Ca.sub.w Sr.sub.x La.sub.y)(Zr.sub.z Ti.sub.(1-z))O.sub.3 ; wherein v is ideally between 0.9 and 1.3; w is ideally between 0 and 0.1; x is ideally between 0 and 0.1; y is ideally between 0 and 0.1, and z is ideally between 0 and 0.9. In addition, the chemical composition of the ferroelectric film is further specified in that the measured opposite state charge at a specific time and temperature of the ferroelectric capacitor is greater than eight micro-Coulombs per square centimeter, and the rate of imprint degradation is less than fifteen percent per decade.
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: September 1, 1998
    Assignee: Ramtron International Corporation
    Inventors: Lee Kammerdiner, Tom Davenport, Domokos Hadnagy
  • Patent number: 5142437
    Abstract: A ferroelectric capacitor for an integrated circuit includes a stack formed by a layer of a noble metal, a layer of a conducting oxide, a layer of a ferroelectric material, another layer of a conducting oxide and another layer of a noble metal. The capacitor can also have another layer of conducting oxide located over the top layer of noble metal and below the first layer of the noble metal. A method of forming the same through establishing one layer over the other and annealing each layer is also disclosed.
    Type: Grant
    Filed: June 13, 1991
    Date of Patent: August 25, 1992
    Assignee: Ramtron Corporation
    Inventors: Lee Kammerdiner, Maria Huffman, Manoochehr Golabi-Khoozani
  • Patent number: 4835118
    Abstract: A process of manufacturing selectively restructurable conductive links between circuit elements and corresponding spare elements on a semiconductor. A continuous green light laser directed at a non-conductive amorphous region in the links causes the region to recrystallize. This makes the link electrically conductive thereby joining the circuit elements to a corresponding spare element on the semiconductor. The method permits for high density packing of circuit elements and creates a link without producing bulk material movement.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: May 30, 1989
    Assignee: INMOS Corporation
    Inventors: Robert E. Jones, Jr., Lee Kammerdiner, Michael R. Reeder