Patents by Inventor Elizabeth McRae

Elizabeth McRae 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).

  • Tactile alarm system for gaining the attention of an individual
    Patent number: 4731603
    Abstract: In an alarm system for gaining the attention of an individual requiring neither sound nor light for its operation, a transmitter unit is activated to send a signal at a predetermined frequency into an induction loop to be received by a receiver unit worn on the person of the individual whose attention it is intended to gain. The transmitter unit sends its signal for at least a predetermined period and the receiver unit responds by activating a mechanical agitator of selectable frequency and amplitude to cause bodily displacement of the receiver unit in a cyclic, periodic manner.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: March 15, 1988
    Assignee: Unisys Corporation
    Inventors: Elizabeth McRae, Cameron McKenzie