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US 4,714,914 AGranted
Liquid immersion alarm
AssigneeAutomatic Safety Products
InventorRichard A. Boe
Life of this patent
Estimating the term…
Abstract
A liquid immersion alarm is shown having a remote transmitter activated by a water immersion switch to generate an alarm signal. The alarm signal is received by a receiver that activates an alarm. Immersion of the transmitter and its immersion switch momentarily into water will not set off a false alarm due to a delay circuit associated with the transmitter. Once immersed, entrapped air will not interrupt the delay circuit from setting off the alarm due to a second delay circuit.
Claims15
A liquid immersion device adapted to be worn by a user and insensitive to the random presence of said liquid, comprising:
- a battery power source having first and second terminals with said second terminal connected to ground;
- a load device having an input terminal connected to said first terminal of said battery power source and a ground terminal;
- a liquid activated switch having first and second terminals with said first terminal connected to said first terminal of said battery power source;
- a delay circuit having first, second and third terminals, including:
- said first terminal connected to said second terminal of said liquid activated device, said second terminal connected to said ground terminal of said load device and said third terminal connected to ground;
- an electrically activated solid state flip flop switch having a set terminal;
- electronic integrating accumulation circuit means for delaying the activation of said electrically activated solid state flip flop switch connected to said set terminal;
- and
- electronic integrating decumulation circuit means to control the accumulation of said first mentioned electronic integrating accumulation circuit means connected between said set terminal and ground;
- said delay circuit thus connecting said second terminal of said battery power source to said ground terminal of said load through said delay circuit after said first and second terminals of said liquid activated device are immersed in liquid for a predetermined time period, whereby said timed immersion causes said battery power source to be connected to said load device to transmit an alarm signal.
7 more elements
Dependencies are inferred from the claim text.