Patents by Inventor Mostafa Hedayatnia

Mostafa Hedayatnia 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).

  • Rocking vibrator alert apparatus driven by opposite phases of a frequency generator
    Patent number: 5488351
    Abstract: A miniature vibrator (50) for a wrist (10) worn alerting device (20) such as a pager produces a rocking motion vibratory alert. The vibrator (50) has a pair of cantilevered piezoelectric resonant vibrators (62, 64, 66 and 72, 74, 76) which are driven by separate drivers (34, 38) at a frequency determined by a frequency generator (32) but at opposite phases because of an inverter (36). Since the vibrating masses (64, 74) move in opposite directions (200, 210), translational movement of the alerting device (20) is substantially eliminated and a resulting rocking motion produces an improved vibratory sensation on the wrist (10) of the user. Additionally, driving the resonant vibrators (62, 64, 66 and 72, 74, 76) at opposite phases results in reduced surge currents (150) on the battery (40).
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: January 30, 1996
    Assignee: Motorola, Inc.
    Inventors: Mostafa Hedayatnia, Margaret Graham-Meighan