Patents by Inventor Juergen Riesmeyer

Juergen Riesmeyer 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).

  • Circuit arrangement for a telephone station with earth connection to the central supply device
    Patent number: 4841568
    Abstract: A circuit arrangement for a telephone station with earth connection to the central supply device for the purpose of post-dialing signaling, operates independently of whether the negative or the positive pole of the exchange battery is earthed. This is achieved by provided that, on the actuation of the earthing key, the earth connection of the telephone is connected to the unearthed pole of the exchange battery via a transistor network which functions differently in dependence upon the polarity of the exchange battery earthing. The circuit arrangement is universally suitable for PBX exchanges.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: June 20, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventor: Juergen Riesmeyer
  • Circuit arrangement for a telephone station with ground connection
    Patent number: 4809322
    Abstract: The invention relates to a circuit arrangement for a telephone station with ground connection to a central supply device for the purpose of post-dialling signalling. The circuit arrangement operates independently of which terminal of an exchange battery in the central supply device is connected to ground. A second polarity reversal protection device (rectifier bridge) is used as an indicator of the polarity of the exchange battery, so that, dependent upon the polarity, different grounding paths are formed in the telephone station. The circuit arrangement is universally suitable for PBX exchanges.
    Type: Grant
    Filed: February 29, 1988
    Date of Patent: February 28, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventor: Juergen Riesmeyer
  • Circuit for surge voltage protection in electronic telephone stations
    Patent number: 4727571
    Abstract: A circuit for surge voltage protection of therefor a telephone station has first and second input terminals for receiving a DC supply voltage via a two-wire subscriber line. Both terminals are shunted via a varistor. In parallel with the varistor is an element for protecting the circuit against polarity reversals. This element has two outputs, one of them carries the positive potential of the DC supply voltage and both of them are connected with respective terminals of the actual station circuit. A V-MOS or bipolar tranistor is arranged between the one output and the associated station circuit terminal. This transistor belongs to a current limiting circuit and serves also as a dialswitch-pulsing contact. The transistor circuit contains two further transistors and a number of dimensioning resistors. The positive output of the protection element is connected to the keyboard-sided input of the transistor circuit via a series network formed by a reverse Zener-diode and a resistor.
    Type: Grant
    Filed: October 21, 1986
    Date of Patent: February 23, 1988
    Assignee: Siemens Aktiengesellschaft
    Inventors: Alfred Brandstetter, Juergen Riesmeyer