Patents by Inventor Darbha Suryanarayana

Darbha Suryanarayana 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: 5872337
    Abstract: Reinforcement members are disposed along only the transverse edge regions of selected flexible cables of an integral chip carrier and cable assembly, and along only the respectively aligned end areas of the chip carrier portion of the assembly. The reinforcement members may be disposed along all of the flexible cables and end areas of the assembly, or on only selected cable and end area portions of the assembly. The reinforcement members are formed of a tough tear resistant polymer material, such as a hot melt adhesive or polymer tape or film.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: February 16, 1999
    Assignee: International Business Machines Corporation
    Inventors: Donald Seton Farquhar, Stephen Joseph Fuerniss, Charles Robert Davis, David Lee Questad, Darbha Suryanarayana, Jeffrey Alan Zimmerman
  • Patent number: 5274913
    Abstract: Disclosed is a reworkable circuit .package formed by controlled collapse chip connection ("C4") bonding of integrated circuit chips to circuit cards and boards, and direct chip attachment ("DCA") where an encapsulant is disposed under the chip. The encapsulant offers protection of the C4 connections and a thermal expansion matched to that of the C4 joints. However, most encapsulants interfere with reworkability. The disclosed circuit package overcomes this problem by the provision of a passivating layer of Parylene is reworkable, dry processable, uniformly depositable by vapor phase deposition, forming thin films on facing surfaces at the 3-5 micron film thickness corresponding to the C4 lift-off distance.
    Type: Grant
    Filed: October 25, 1991
    Date of Patent: January 4, 1994
    Assignee: International Business Machines Corporation
    Inventors: Kurt R. Grebe, Jack M. McCreary, Darbha Suryanarayana, Ho-Ming Tong
  • Patent number: 4772346
    Abstract: In a process for forming elements from a slurry that includes particulate ceramic and/or glass, an organic binder resin, and a solvent for the resin, where the element is shaped from the slurry, and the element heated to remove the organic materials of the slurry and subsequently fuse the ceramic and/or glass particles, the improvement comprised of coating the ceramic and/or glass particles prior to forming the slurry with a surface modification compound selected from the group consisting of organo silanes, organo silazanes, titanium chelates, titanium esters, and mixtures thereof.
    Type: Grant
    Filed: October 29, 1987
    Date of Patent: September 20, 1988
    Assignee: International Business Machines Corporation
    Inventors: Herbert R. Anderson, Jr., Constance J. Araps, Renuka S. Divakaruni, Daniel P. Kirby, Robert W. Nufer, Harbans S. Sachdev, Krishna G. Sachdev, Darbha Suryanarayana, Stoyan M. Zalar