Fluid-operated communication system
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United States of America Patent
Stats
-
Jan 5, 2010
Grant Date -
Oct 16, 2008
app pub date -
Jul 9, 2007
filing date -
Nov 22, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A communication system including a fluid-operated calling device mounted in a first location in a building, and a fluid-operated indicator mounted in a second location in a building and in fluid communication with the fluid-operated calling device, wherein actuation of the fluid-operated calling device causes the fluid-operated indicator to provide an indication that the fluid-operated calling device has been actuated. A fluid-operated lock may be mounted near the fluid-operated calling device and in fluid communication with a fluid-operated actuator, wherein actuation of the fluid-operated actuator causes opening of the fluid-operated lock.
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