Patents by Inventor Walter K. Layfield

Walter K. Layfield 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).

  • Alarm device
    Patent number: 5734325
    Abstract: An alarm device for night deposit boxes consists of a housing with a tear gas or dye-releasing alarm in a housing mountable inside the deposit box. The housing includes electrical circuitry, which is connected by a flexible conductor cable to a trigger switch fitting into a magnetic keeper. The keeper is mechanically connected to the deposit box door assembly by a flexible cable. The circuitry includes a key-operated disabling switch and a light-emitting diode which is momentarily energized through a capacitor when the circuit is enabled.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: March 31, 1998
    Assignee: ICI Americas Inc.
    Inventors: Raymond C. Johnson, Walter K. Layfield, Michael J. Epple, Gregory J. Burns, James J. Walker, Michael J. Grajewski