The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 1982
Filed:
Jul. 07, 1980
Applicant:
Inventor:
Bard Holand, Trondheim, NO;
Assignee:
SINTEF (Selskapet for industriell og teknisk forskning ved NTH), Trondheim, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
367134 ; 367137 ; 367142 ; 367910 ;
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.