Patents by Inventor Bard Holand

Bard Holand 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).

  • Acoustic beacons
    Patent number: 4312054
    Abstract: Acoustic beacon for use at sea and having a pipe-shaped housing in the one nd of which is space for a battery which drives a transmitter disposed coaxially around the housing at the other end where there is arranged a pressure switch covered by a membrane. The transmitter is switched on by the pressure switch when the pressure on the outside of the membrane exceeds a certain limit when the beacon falls in water.
    Type: Grant
    Filed: July 7, 1980
    Date of Patent: January 19, 1982
    Assignee: SINTEF (Selskapet for industriell og teknisk forskning ved NTH)
    Inventor: Bard Holand