Patents by Inventor Seppo Yrjölä

Seppo Yrjölä 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).

  • Antenna filtering arrangement for a dual mode radio communication device
    Patent number: 6185434
    Abstract: A dual mode radio apparatus has an integrated filtering part (51) which includes an antenna port (51a) for connection to an antenna (21), at least one port (51b, 51c, 51d) for connection to each of the system-specific radio-frequency parts (54, 55) of the dual mode radio apparatus and filtering means for directing the propagation of signals between ports on the basis of the signal frequency. The integrated filtering part replaces earlier separate filters and their impedance matching circuits as well as some of the required radio-frequency switches.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: February 6, 2001
    Assignee: LK-Products OY
    Inventors: Panu Hagström, Seppo Yrjölä