Patents by Inventor Thomas C. Singer

Thomas C. Singer 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 telephone and calculator with common keyboard having reversible indicia
    Patent number: 4088837
    Abstract: In a combination telephone set which includes a housing, a numerical keyboard disposed on the housing which has at least ten keys, and an electronic calculator contained within the housing, and wherein the keys are selectably useable as input means for the telephone set so as to generate a plurality of tones, and for the calculator so as to process data, and wherein at least ten indicia are disposed on each of the keys respectively, the improvement which includes selection means for reversibly changing at least one of the indicia disposed on at least one of the keys from operation as the input means for the telephone set to another of the indicia for operation as the input means for the calculator.
    Type: Grant
    Filed: January 7, 1977
    Date of Patent: May 9, 1978
    Inventor: Thomas C. Singer