Patents Represented by Law Firm Skjerven, Morrill, MacPerson, Franklin & Friel
  • Programmable synchronous step down DC-DC converter controller
    Patent number: 5943227
    Abstract: An monolithic programmable dc--dc converter controller integrated circuit with a high speed synchronous controller and a 4-bit programmable DAC to provide an operating voltage to an external device such as a microprocessor in response to a code programmed in the external device. The 4-bit programmable DAC outputs a signal which is combined with a precise reference voltage to provide voltages to the external device in increments of 100 millivolts.
    Type: Grant
    Filed: June 26, 1996
    Date of Patent: August 24, 1999
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Stephen W. Bryson, Tony Wong, Brian C. Lombard
  • Masking material for applications in plasma etching
    Patent number: 5292402
    Abstract: Materials of the lead perovskite family PbZr.sub.x Ti.sub.1-x O.sub.3 have been discovered to be excellent masking materials in the etching of silicon and silicon-containing materials with chlorine and fluorine -based plasmas. Generally, materials of the lead perovskite family are suitable masking materials for any material that is etched in chlorine and fluorine -based plasmas.
    Type: Grant
    Filed: July 9, 1992
    Date of Patent: March 8, 1994
    Assignee: National Semiconductor Corporation
    Inventors: Norman E. Abt, Sheldon Aronowitz