Patents by Inventor Marius P. Serfontein

Marius P. Serfontein 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 to prevent drowning
    Patent number: 5619187
    Abstract: A warning device for the prevention of drowning includes a sensor 10 incorporating a transmitter, the sensor being attachable to the body of a person. The transmitter is actuated upon submersion in water. The signal emitted by the transmitter is received by receiver 12 which is then adapted to initiate an alarm in the form of a siren, flashing light or lights or a transmission to other alarm systems. A directional antenna may be included for nautical situations where the wearer is thrown overboard.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: April 8, 1997
    Inventor: Marius P. Serfontein