Patents by Inventor Carlton L. Frederick

Carlton L. Frederick 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).

  • Encoding altimeter
    Patent number: 4047001
    Abstract: The pressure of the atmosphere is sensed by a pressure transducer which causes a resistance to vary. The variance of this resistor is converted to a variable frequency. The number of cycles of this frequency in a set amount of time is counted by a counter and displayed by a digital display.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: September 6, 1977
    Inventors: Norman M. Witriol, Carlton L. Frederick
  • Encoding altimeter
    Patent number: 4027143
    Abstract: The pressure of the atmosphere is sensed by a pressure transducer which causes a resistance to vary. The variance of this resistor is converted to a variable frequency. The number of cycles of this frequency in a set amount of time is counted by a counter and displayed by a digital display. An up/down counter is loaded with the count of the last digital readout in the previous cycle and counts down the number of cycles in the frequency of the next reading and displays the difference on a digital display or activates a sonic output if the countdown is greater than the stored previous count.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: May 31, 1977
    Inventors: Norman M. Witriol, Carlton L. Frederick
  • Encoding altimeter
    Patent number: 3961272
    Abstract: The pressure of the atmosphere is sensed by a pressure transducer which causes a resistance to vary. The variance of this resistor is converted to a variable frequency. The number of cycles of this frequency in a set amount of time is counted by a counter and displayed by a digital display. An up/down counter is loaded with the count of the last digital readout in the previous cycle and counts down the number of cycles in the frequency of the next reading and displays the difference on a digital display or activates a sonic output if the countdown is greater than the stored previous count.
    Type: Grant
    Filed: December 17, 1974
    Date of Patent: June 1, 1976
    Inventors: Norman M. Witriol, Carlton L. Frederick