Patents by Inventor John L. Linder

John L. Linder 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: 3971923
    Abstract: A control circuit having a digital memory for providing sweep voltages to ceivers in a doppler satellite tracking station of proper amplitude and duration to ensure searching in the correct doppler frequency range. An internally generated ramp function voltage is combined with a reference voltage to produce a composite sweep signal for the receiver. The reference voltage level is determined either from a set of digi-switches or from a digital memory circuit which outputs a digital signal that is a function of the frequency of a received doppler signal.
    Type: Grant
    Filed: March 31, 1975
    Date of Patent: July 27, 1976
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: John L. Linder
  • Patent number: 3958243
    Abstract: A control circuit having a digital memory for providing sweep voltages to ceivers in a doppler satellite tracking station of proper amplitude and duration to ensure searching in the correct doppler frequency range. An internally generated ramp function voltage is combined with a reference voltage to produce a composite sweep signal for the receiver. The reference voltage level is determined either from a set of digi-switches or from a digital memory circuit which outputs a digital signal that is a function of the frequency of a received doppler signal.
    Type: Grant
    Filed: March 20, 1975
    Date of Patent: May 18, 1976
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: John L. Linder
  • Patent number: 3935539
    Abstract: A digital frequency correlator circuit for comparing the frequencies of a urality of a-c signals to determine if they are coherent within a predetermined number of cycles. The a-c signals are converted into digital numbers representing their frequencies. The digital numbers are subtracted and the difference is compared, utilizing an exclusive-or circuit, with a predetermined number of cycles. If the difference is greater than the predetermined number of cycles, a logic 0 is outputted. If the difference is equal to or less than the predetermined number of cycles, a logic 1 is outputted.
    Type: Grant
    Filed: October 21, 1974
    Date of Patent: January 27, 1976
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: John L. Linder