Detection system

Details Detection system Detection system

1974-04-19

1977-10-25

Caldwell, John W.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340214, 340229, 340240, 340244R, 340418, 169 57, 137557, G08B 1900, A62C 3724, A62C 3702

Patent

active

040558444

ABSTRACT:
A static fluid system for detecting a selected change in an ambient condition. The system includes an elongate closed fluid line having a selected absolute pressure and pressure means to maintain the line pressure. Sensing means in the line respond to selected changes in ambient conditions to open the line and change the line to ambient pressure. Signal means responds to the change in line pressure, and flow restricting means in the line maintains the line pressure under normal ambient conditions and precludes re-establishment of the line pressure when the sensing means is activated to open the fluid line.

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patent: 583405 (1897-05-01), Corbett
patent: 1557250 (1925-10-01), Grandfield
patent: 2132132 (1938-10-01), Seat
patent: 2575469 (1951-11-01), Rider
patent: 2591959 (1952-04-01), McRae
patent: 3014206 (1961-12-01), Slavin
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patent: 3220206 (1965-11-01), Armentrout et al.
patent: 3682129 (1972-08-01), Philbrick
patent: 3772671 (1973-11-01), Owen
patent: 3800878 (1974-04-01), Poitras
patent: 3840867 (1974-10-01), Welk, Jr.
patent: 3876011 (1975-04-01), Poitras

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