Patents Assigned to Quality Technology Ltd.
  • Remote switching apparatus
    Patent number: 4078236
    Abstract: A remote switching apparatus, in which a transmitter is adapted to transmit a predetermined number of bursts of single frequency signal, to designate a particular digit. Preferably the group of bursts is preceded by a prepulse of particular character which effectively enables the receiver, preparing it to count the bursts which follow and thus to operate a switch corresponding to the digit. The receiver is thus immune to ambient noises except during the short time interval during which it is enabled.
    Type: Grant
    Filed: April 7, 1975
    Date of Patent: March 7, 1978
    Assignee: Quality Technology Ltd.
    Inventor: Leo Bruce Hempell