With Harmonic Filter Or Neutralizer Patents (Class 307/105)
  • Protective circuit arrangement for a high-voltage capacitor bank
    Patent number: 3984734
    Abstract: A protective circuit for a high-voltage capacitor bank in which the capacitor bank is subdivided into two equal parallel branches with a current measuring device connected in series with each branch and the outputs of the two current measuring devices connected to a differential protection relay.
    Type: Grant
    Filed: October 16, 1975
    Date of Patent: October 5, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventor: Michael Becker
  • Time switch circuit having a switch-back time delay
    Patent number: 3943385
    Abstract: This relates to a circuit for use in a car interlock and permits restarting of the motor for about three minutes after the unfastening of the safety belt. The circuit contains a difference amplifier, a first input switching the supply voltage of a capacitor charging circuit and a second input directly switching the charging circuit.
    Type: Grant
    Filed: October 1, 1974
    Date of Patent: March 9, 1976
    Assignee: ITT Industries Inc.
    Inventor: Gerhard Achtstaetter
  • Seat belt system for automotive vehicles
    Patent number: RE28804
    Abstract: The circuit of this invention provides a safety belt system for both shoulder and seat belts which require the driver and any passengers to positively fasten the seat and shoulder harness in a sequential manner in order for the automobile to be started. After the engine is started, disconnection of any belt or harness causes a buzzer or like alarm to be actuated. The circuit is shown as being operable with either of two relay systems. One system uses a latching relay the other uses a stepping relay.
    Type: Grant
    Filed: May 24, 1974
    Date of Patent: May 4, 1976
    Inventor: Vincent Sardo, Jr.