Patents by Inventor William Davidson

William Davidson 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).

  • Combination absolute and differential temperature system
    Patent number: 4282753
    Abstract: The measurement of small differential temperatures over a wide range of absolute temperatures is accomplished by cyclically switching the excitation polarity to a bridge circuit including the temperature sensors. Additionally, the measuring circuitry includes a differential-differential amplifier configuration and a pair of compensating conductors in the cable to each sensor to achieve equal resistance in each excitation path.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: August 11, 1981
    Assignee: The United States of America as represented by the Secretary of Transportation
    Inventor: William A. Davidson
  • Toy bear figure
    Patent number: D277021
    Type: Grant
    Filed: October 14, 1982
    Date of Patent: January 1, 1985
    Assignee: American Greetings Corporation
    Inventors: Ralph Shaffer, William Davidson
  • Toy bear figure
    Patent number: D277121
    Type: Grant
    Filed: October 14, 1982
    Date of Patent: January 8, 1985
    Assignee: American Greetings Corporation
    Inventors: Ralph Shaffer, William Davidson
  • Toy bear figure
    Patent number: D277123
    Type: Grant
    Filed: October 14, 1982
    Date of Patent: January 8, 1985
    Assignee: American Greetings Corporation
    Inventors: Ralph Shaffer, William Davidson
  • Toy bear figure
    Patent number: D277124
    Type: Grant
    Filed: October 14, 1982
    Date of Patent: January 8, 1985
    Assignee: American Greetings Corporation
    Inventors: Ralph Shaffer, William Davidson
  • Toy bear figure
    Patent number: D277125
    Type: Grant
    Filed: October 14, 1982
    Date of Patent: January 8, 1985
    Assignee: American Greetings Corporation
    Inventors: Ralph Shaffer, William Davidson