Patents by Inventor David T. Shen

David T. Shen 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: 5434524
    Abstract: A method of clocking integrated circuit chips. A pulsed laser striking an integrated circuit module substrate is diffused through the substrate and exits the opposite surface as diffused light pulses. An integrated circuit chip mounted on the top surface of the substrate has optical receivers. The optical receivers receive pulsed energy from the diffused light pulses, converting pulsed light to electrical pulses that clock the chip.
    Type: Grant
    Filed: September 16, 1992
    Date of Patent: July 18, 1995
    Assignee: International Business Machines Corporation
    Inventors: Robert R. Shaw, David T. Shen
  • Patent number: 5404044
    Abstract: A multilayer, high yield and high density integrated circuit (IC) chips interposer and the method of manufacture therefore. A thin polyimide film is circuitized with copper on both sides. One side may be reserved for power or ground with the opposite side being a signal plane. Adhesive is laminated over both sides covering the circuit patterns. Vias are drilled through at least one adhesive surface, and through the polyimide film. Metal (copper) is blanket sputtered to coat the via walls. Polymer Metal Conductive (PMC) paste is screened to at least partially fill the vias. The Blanket metal is sub-etched using the screened PMC as a mask. Layers are stacked to form the interposer with the PMC bonding the stacked layers together and electrically interconnecting between layers.
    Type: Grant
    Filed: November 17, 1993
    Date of Patent: April 4, 1995
    Assignee: International Business Machines Corporation
    Inventors: Richard B. Booth, Robert H. Gephard, Bradley S. Gremban, Janet E. Poetzinger, David T. Shen
  • Patent number: 5386627
    Abstract: A multilayer, high yield and high density integrated circuit (IC) chips interposer and the method of manufacture therefore. A thin polyimide film is circuitized with copper on both sides. One side may be reserved for power or ground with the opposite side being a signal plane. Adhesive is laminated over both sides covering the circuit patterns. Vias are drilled through at least one adhesive surface, and through the polyimide film. Metal (copper) is blanket sputtered to coat the via walls. Polymer Metal Conductive (PMC) paste is screened to at least partially fill the vias. The Blanket metal is sub-etched using the screened PMC as a mask. Layers are stacked to form the interposer with the PMC bonding the stacked layers together and electrically interconnecting between layers.
    Type: Grant
    Filed: November 17, 1993
    Date of Patent: February 7, 1995
    Assignee: International Business Machines Corporation
    Inventors: Richard B. Booth, Robert H. Gephard, Bradley S. Gremban, Janet E. Poetzinger, David T. Shen
  • Patent number: 5146422
    Abstract: An apparatus for converting a multidigit decimal number into a binary number. In a preferred embodiment, the apparatus includes a register for holding the multidigit decimal number; first conversion logic, coupled to the register, for simultaneously converting a first pair of decimal digits in the multidigit decimal number, into a first binary representation and second conversion logic, coupled to said first conversion logic and the register, for simultaneously converting a second pair of decimal digits in the multidigit decimal number and the first binary representation into a second binary representation of a decimal number defined by the first and second pair of decimal digits.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: September 8, 1992
    Assignee: International Business Machines Corp.
    Inventors: Klaus K. Maass, David T. Shen
  • Patent number: 5031138
    Abstract: An essentially symmetrical ratio decoder which covers all areas in both the positive and negative regions with only a small number of noted exceptions. Multiple boundaries were selected such that the positive and negative regions were symmetrical with only a small number of exceptions. Using these boundaries, an essentially symmetrical, unified ratio decoder was constructed using only about one-half of the integrated circuit real estate of conventional ratio decoder pairs. By decoding the sign bit from the ratio decoder adder, the ratio decoder recognizes the exceptional areas and handles them accordingly.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: July 9, 1991
    Assignee: International Business Machines Corporation
    Inventors: Klaus K. Maass, David T. Shen
  • Patent number: 4831494
    Abstract: Disclosed is a multilayer capacitor consisting of a plurality of laminae with each of the laminae including a conductive plate portion and a non-conductive sheet portion. The conductive plate portion has at least one tab projecting to at least one edge of the conductive plate portion with the maximum number of tabs per conductive plate portion being limited to avoid excessive lateral congestion. The laminae are divided into different groups with the laminae from each group having the same number and location of tabs and with the laminae from different groups differing by at least the location of the tabs.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: May 16, 1989
    Assignee: International Business Machines Corporation
    Inventors: Allen J. Arnold, Michael E. Bariether, Shin-Wu Chiang, Hormazdyar M. Dalal, Robert A. Miller, Frank A. Montegari, James M. Oberschmidt, David T. Shen
  • Patent number: 4228520
    Abstract: A high speed multiply apparatus minimizes latch requirements and I/O pin requirement between chips by a new configuration which iteratively adds four multiples of a multiplicand in a stage of 4-2 carry save adders which then feed four-bit parallel adders each having four sum outputs and a carry output from the highest order bit position. Only the sum outputs are latched and then fed to a carry propagate adder on each iteration for addition to the previous partial products. Only the single carry output from each of the 4-bit parallel adders needs to be latched and then fed to another 4-bit parallel adder.
    Type: Grant
    Filed: May 4, 1979
    Date of Patent: October 14, 1980
    Assignee: International Business Machines Corporation
    Inventors: Robert C. Letteney, Samuel R. Levine, David T. Shen, Arnold Weinberger