Patents by Inventor David A. Wolff

David A. Wolff 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: 5565123
    Abstract: A control circuit for a stove, cooktop or oven utilizing at least one electrical radiant heating element. The circuit effectively compares a controlled voltage and internally generated saw-tooth voltage wave to control the percent power to the radiant element. Also included is a slow start feature to minimize power surge when first energizing the element.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: October 15, 1996
    Assignee: Robertshaw Controls Company
    Inventor: David A. Wolff
  • Patent number: 5528017
    Abstract: An electronic thermostat for use with cooking ovens that may include oven cleaning features. An analog comparator is utilized to compare reference voltage with voltage representative temperature changes sensed within the oven, to control the oven heating element.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: June 18, 1996
    Assignee: Robertshaw Controls Company
    Inventor: David A. Wolff
  • Patent number: 4496882
    Abstract: An internally generated raster scanning circuit includes self correction for pincushion distortion by multiplying the horizontal parabolic wave form by the vertical saw-tooth wave form. The multiplier is biased to provide the required 180.degree. phase shift at the midpoint of the waveform. The multiplied signals are coupled back to an input of the existing power amplifier and a corrected current is then supplied to the vertical yoke coil, requiring no added reactor transformer. The balance or ratio of the top and bottom correction currents can be adjusted as required by a simple control in the multiplier circuit.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: January 29, 1985
    Assignee: Motorola, Inc.
    Inventors: Kirk D. Oliver, David A. Wolff
  • Patent number: D405858
    Type: Grant
    Filed: April 12, 1991
    Date of Patent: February 16, 1999
    Inventor: David A. Wolff