Patents by Inventor Varaprasad Venkata Calmidi

Varaprasad Venkata Calmidi 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: 6675852
    Abstract: A platen for use in a laminating press is provided which includes a body of material having first and second faces and spaced first and second ends. Preferably, at least one heating device is disposed in the body of material. First and second spaced cooling channels are formed in the body of material, the first cooling channel being adjacent the first face and having a fluid inlet port adjacent to or in the first end, and a fluid outlet port adjacent to or in the second end, and a second cooling channel being adjacent the second face and having a fluid inlet port adjacent to or in said second end, and a fluid outlet port adjacent to or in the first end. The invention also contemplates using such platens for laminating a book or stack of sheets of material to form a unitary single member having reduced stresses.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: January 13, 2004
    Assignee: International Business Machines Corporation
    Inventors: Varaprasad Venkata Calmidi, Donald S. Farquhar, Michael Joseph Klodowski, Randall Joseph Stutzman
  • Patent number: 6631078
    Abstract: A heat dissipating flexible or resilient standoff is mechanically clamped between an electronic module and substrate, such as, PCB. The clamping arrangement comprises a heat sink compressing a thermally conductive flexible interface pad over the upper surface of the electronic module by way of mechanical linkage to the PCB. The heat dissipating flexible standoff provides a force opposing the compression force to thereby reduce stress on solder ball connections between electronic module and PCB. Thermally conductive flexible standoffs in the form of spring arrangements, such as a wire mesh, act to provide heat dissipation by both thermal conduction and thermal convection. A thermally conductive flexible polymer pad and a layer of porous metal foam may also act as thermally conductive standoffs.
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: October 7, 2003
    Assignee: International Business Machines Corporation
    Inventors: David J. Alcoe, Varaprasad Venkata Calmidi, Krishna Darbha, Sanjeev Balwant Sathe
  • Publication number: 20030129863
    Abstract: A heat dissipating flexible or resilient standoff is mechanically clamped between an electronic module and substrate, such as, PCB. The clamping arrangement comprises a heat sink compressing a thermally conductive flexible interface pad over the upper surface of the electronic module by way of mechanical linkage to the PCB. The heat dissipating flexible standoff provides a force opposing the compression force to thereby reduce stress on solder ball connections between electronic module and PCB. Thermally conductive flexible standoffs in the form of spring arrangements, such as a wire mesh, act to provide heat dissipation by both thermal conduction and thermal convection. A thermally conductive flexible polymer pad and a layer of porous metal foam may also act as thermally conductive standoffs.
    Type: Application
    Filed: January 10, 2002
    Publication date: July 10, 2003
    Applicant: International Business Machines Corporation
    Inventors: David J. Alcoe, Varaprasad Venkata Calmidi, Krishna Darbha, Sanjeev Balwant Sathe
  • Publication number: 20020189755
    Abstract: A platen for use in a laminating press is provided which includes a body of material having first and second faces and spaced first and second ends. Preferably, at least one heating device is disposed in the body of material. First and second spaced cooling channels are formed in the body of material, the first cooling channel being adjacent the first face and having a fluid inlet port adjacent to or in the first end, and a fluid outlet port adjacent to or in the second end, and a second cooling channel being adjacent the second face and having a fluid inlet port adjacent to or in said second end, and a fluid outlet port adjacent to or in the first end. The invention also contemplates using such platens for laminating a book or stack of sheets of material to form a unitary single member having reduced stresses.
    Type: Application
    Filed: June 15, 2001
    Publication date: December 19, 2002
    Applicant: International Business Machines Corporation
    Inventors: Varaprasad Venkata Calmidi, Donald S. Farquhar, Michael Joseph Klodowski, Randall Joseph Stutzman