Patents by Inventor Walter F. Merrithew

Walter F. Merrithew 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).

  • Swimmer protection and pool safety warning device
    Patent number: 5097254
    Abstract: A swimmer protection and pool safety warning device comprises a portable sonic signal generating member worn by a swimmer in a pool, the signal generating member having a switch or similar device which is activated at a predetermined depth. Also included is a timer for detecting immersion at said predetermined depth for a predetermined time. On immersion occurring at the predetermined depth for the predetermined time, a sonic signal is generated, and detected by a receiver mounted in the pool. An alarm signal is generated to operate an alarm device. Calibration of the source signal generating member can be provided.
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: March 17, 1992
    Inventor: Walter F. Merrithew