Patents by Inventor Leonard C. Ritchie

Leonard C. Ritchie 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).

  • Latch and data out driver for memory arrays
    Patent number: 5239506
    Abstract: A latch and driver circuit is disclosed for use in reading out data from a random access memory cell. The invention, which may be implemented in BICMOS technology, accomplishes high-speed asynchronous latching, level translation and output driving operations. The invention includes a latch and at least one output driver coupled in parallel to a latch driver.
    Type: Grant
    Filed: February 4, 1991
    Date of Patent: August 24, 1993
    Assignee: International Business Machines Corporation
    Inventors: William R. Dachtera, Leonard C. Ritchie, Arthur D. Tuminaro
  • Gate array chip
    Patent number: 4613958
    Abstract: Disclosed is a memory cell circuit for a gate array. The memory cell circuit is D.C. testable and has particular utility when employed in an integrated circuit containing "a mix of logic and array".Also disclosed is a memory array particularly adapted for use in an integrated circuit containing TTL logic circuits.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: September 23, 1986
    Assignee: International Business Machines Corporation
    Inventors: Edward F. Culican, Matthew C. Graf, Leonard C. Ritchie