Patents by Inventor Rafi Rahamim

Rafi Rahamim 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).

  • Low-voltage transistor circuit for suppressing high-voltage surges in a telephone line interface circuit
    Patent number: 6665400
    Abstract: A relay-less telephone line interface circuit is disclosed which incorporates a low-voltage transistor to suppress high-voltage, short-term voltage surges. Specifically, a low-voltage transistor such as a Central Semiconductor C2TA44, a Motorola MPSA42, or similar such transistors actually can withstand a high-voltage spike exceeding the manufacturers specified parameters. The present circuit exploits this undocumented feature by employing such a transistor in combination with a metal oxide varistor in order to provide adequate voltage surge protection for the interface circuit. Thus, a zenor diode is not necessary (avoiding on-hook problems) and the relay-less circuit still passes the FCC Part 68 test.
    Type: Grant
    Filed: April 23, 1999
    Date of Patent: December 16, 2003
    Assignee: PCTEL, Inc.
    Inventors: Rafi Rahamim, Brian Stroud