Patents by Inventor Laurens C. Van Leeuwen

Laurens C. Van Leeuwen 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).

  • Communication set with detection of set function and line condition
    Patent number: 7224793
    Abstract: A description is given of a communication set for connection to a communication line such as a telephone line, which communication set includes means for detecting set functions such as ringing signal detection, and a rectifier circuit which is connected to a common output which is coupled to a scanning device included in the set function detection means, which scanning device detects the line conditions. A large number of line conditions may be detected with a minimum of components required, among which an analog/digital converter for which only a single input pin on a chip is necessary.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: May 29, 2007
    Assignee: Philips Electronics North America Corp.
    Inventors: Peter J. M. Sijbers, Franciscus J. M. Thus, Laurens C. Van Leeuwen
  • Wire bound telecommunications device and a power supply circuit
    Patent number: 6728372
    Abstract: Known is a wire bound telecommunications device to be coupled to telecommunication lines comprising a transmission circuit coupled between the telecommunications lines, which transmission circuit comprises a power supply circuit for forming a supply voltage from a telecommunications line voltage, whereby the power supply circuit comprises sensing means for sensing a telecommunications line current and adjustment means for adjusting the supply voltage, a supply voltage terminal being coupled to the sensing means. In the known device, no optimal matching is obtained for the load line of the power supply to a DC-mask for line voltages as a function of a line current as prescribed for a given country. A more optimal matching is proposed.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: April 27, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Johannes J. Soree, Laurens C. Van Leeuwen
  • WIRE BOUND TELECOMMUNICATIONS DEVICE AND A POWER SUPPLY CIRCUIT
    Publication number: 20010050986
    Abstract: Known is a wire bound telecommunications device to be coupled to telecommunication lines comprising a transmission circuit coupled between the telecommunications lines, which transmission circuit comprises a power supply circuit for forming a supply voltage from a telecommunications line voltage, whereby the power supply circuit comprises sensing means for sensing a telecommunications line current and adjustment means for adjusting the supply voltage, a supply voltage terminal being coupled to the sensing means. In the known device, no optimal matching is obtained for the load line of the power supply to a DC-mask for line voltages as a function of a line current as prescribed for a given country. A more optimal matching is proposed.
    Type: Application
    Filed: April 28, 1998
    Publication date: December 13, 2001
    Inventors: JOHANNES J. SOREE, LAURENS C. VAN LEEUWEN