Abstract 1,048,941. Buoys. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. Jan. 13, 1964 [Jan. 14, 1963], No. 1490/64. Heading B7A. [Also in Divisions G4 and H3] In an acoustic control system (see Division G4) a buoy, used for indicating the position of an underwater well installation comprises a buoyancy tank 10 secured to a buoyline housing 11 by means of a tubular member 12. The buoy line 13 is anchored at 15 to a container 17 fastened to an underwater installation. The buoy 10 is retained in the container 17 by means of spring-loaded dogs 18 which latch into a slot 19. When an acoustic signal is received by apparatus (see Division H3) in a pressure-tight housing 20, the power supply to the apparatus becomes energized, actuating a solenoid which releases the latching dogs 18 and allows the buoy 10 to rise.
A REMOTELY CONTROLLED SYSTEM REQUIRING NO CONSUMPTION OF POWER WHEN IN A STANDBY CONDITION AND WHICH IS RESPONSIVE TO A MODULATED CARRIER WAVE SIGNAL OF A PRESELECTIVE CARRIER FREQUENCY COMPRISING: A NORMALLY UNENERGIZED AND INOPERATIVE RECEIVER, SAID RECEIVER INCLUDING MEANS FOR DEMODULATING SAID CARRIER WAVE; A SOURCE OF POWER; FIRST NORMALLY UNENERGIZED CIRCUIT MEANS CONNECTED TO THE INPUT OF SAID RECEIVER AND RESPONSIVE TO AN INPUT SIGNAL OF SAID PRESELECTED CARRIER FREQUENCY FOR
Claim 2
Dependent Claim
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A REMOTELY CONTROLLED SYSTEM REQUIRING NO CONSUMPTION OF POWER WHEN IN A STANDBY CONDITION AND WHICH IS RESPONSIVE TO A MODULATED CARRIER WAVE SIGNAL OF A PRESELECTIVE CARRIER FREQUENCY COMPRISING: A NORMALLY UNENERGIZED AND INOPERATIVE RECEIVER, SAID RECEIVER INCLUDING MEANS FOR DEMODULATING SAID CARRIER WAVE; A SOURCE OF POWER; FIRST NORMALLY UNENERGIZED CIRCUIT MEANS CONNECTED TO THE INPUT OF SAID RECEIVER AND RESPONSIVE TO AN INPUT SIGNAL OF SAID PRESELECTED CARRIER FREQUENCY FOR