Patents by Inventor Eduard F. B. Boeckmann

Eduard F. B. Boeckmann 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).

  • Electronic hold circuit
    Patent number: 4440981
    Abstract: In a hold circuit connectable to a subscriber telephone line, a silicon controlled rectifier is turned on by a user operated momentary pushbutton connecting the positive side of the line to the hold circuit. A comparator circuit sensing the initial value of the loop voltage, turns on a transistor and connects a line seizing network across the subscriber line.
    Type: Grant
    Filed: November 26, 1982
    Date of Patent: April 3, 1984
    Assignee: GTE Automatic Electric Inc.
    Inventors: Gary Grantland, Hugh S. Montgomery, Eduard F. B. Boeckmann, Larry A. Woodworth
  • Latching relay hold circuit for a telephone instrument
    Patent number: 4435622
    Abstract: In a hold circuit connectable to a subscriber telephone line, a line voltage storage capacitor is momentarily connected to the subscriber line charging to line potential and providing trigger current to a silicon controlled rectifier. When sufficient trigger current is gained the silicon controlled rectifier turns on discharging the capacitor through a latching relay coil and a transistor, thereby turning on the relay and connecting the hold circuit. The transistor is turned on by a bias voltage from the capacitor when the silicon controlled rectifier is turned on.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: March 6, 1984
    Assignee: GTE Automatic Electric Inc.
    Inventors: Gary Grantland, Eduard F. B. Boeckmann