Patents by Inventor Macwein Krishnamurthi

Macwein Krishnamurthi 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).

  • Audio accessory switching circuit
    Patent number: 6980827
    Abstract: This invention includes a switching circuit that allows a cellular phone with an audio accessory to arbitrate between cellular telephone calls and other audio inputs. In one embodiment, a cellular telephone having a MP3 accessory uses the invention to automatically switch a single set of speakers from the stereo MP3 signal to the mono phone signal whenever a call is transmitted or received. An advantage of the invention is that the user need not switch between music and phone call when the phone rings, as the invention takes care of this automatically.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: December 27, 2005
    Assignee: Motorola, Inc.
    Inventors: Tan Thok Lin, Soo Kee Eng, Macwein Krishnamurthi, Nasrudin B Abd. Muthalib