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Class Information
Number: 116/70
Name: Signals and indicators > Alarms > Fluid-pressure variation
Description: Alarms set off by a change in the pressure of a fluid, as a check in the flow of gas in a gas-main, a break in any of the hollow bars across jail, bank, or vault windows or doors, train air-brake pipes, etc. These alarms are generally fault or defect or burglar alarms as distinguished from signalling devices.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8245726 Citrus juice apparatus with undesired material release detector and related methods Aug. 21, 2012
7793607 Air powered civil defense siren Sep. 14, 2010
7713339 Filter change indicator May. 11, 2010
7673914 Automatic alert device for suction cup Mar. 9, 2010
7621978 Filter timer Nov. 24, 2009
7565916 Pneumatic oscillating valve and pneumatic warning device Jul. 28, 2009
7364610 Air filter sensor Apr. 29, 2008
7207524 Device for warning of differential pressure during the opening of a pressurized closing device pertaining to an opening in the fuselage of an aeroplane Apr. 24, 2007
6837922 Air filter sensor apparatus kit and method Jan. 4, 2005
6494160 Ringing kettle Dec. 17, 2002
6412435 Dirty filter indicator Jul. 2, 2002
6386136 Tea kettle whistle May. 14, 2002
6320513 Dirty filter indicator Nov. 20, 2001
6299006 Whistling beverage bottle construction Oct. 9, 2001
6273130 Gas regulator/valve device Aug. 14, 2001
6273285 Structure of a whistling device for a cooker lid Aug. 14, 2001
6209579 Low supply pressure alarm for gas supply Apr. 3, 2001
6202875 Whistling device of a cooker lid Mar. 20, 2001
6155196 Multi-depth acoustic signal generating device Dec. 5, 2000
6142094 Depth sensitive mechanical acoustic signal generating device Nov. 7, 2000
6102240 Animated kettle Aug. 15, 2000
6004000 Temperature indicating device for a cooking vessel Dec. 21, 1999
5950862 Animated kettle Sep. 14, 1999
5791282 Fire detection port Aug. 11, 1998
5664478 Spring brake actuator with corrosion fuses Sep. 9, 1997
5555905 Cassette type gas cylinder with remaining volume alarm unit and manufacturing method thereof Sep. 17, 1996
5534090 Dosimeter capsule indicating service life of a rocket motor Jul. 9, 1996
5471912 Vessel having boiling indicating device Dec. 5, 1995
5452819 Air valve fuel fill cap Sep. 26, 1995
5352255 Noise maker for air filter Oct. 4, 1994
5325809 Hair dryer with alarm notifying user of clogged filter Jul. 5, 1994
5226447 Valve malfunctin detection apparatus Jul. 13, 1993
5184858 Sucker for plate glass Feb. 9, 1993
5170634 Acoustic vapor type indicator Dec. 15, 1992
5051360 Method for detecting microorganism activity Sep. 24, 1991
5040477 Warning device for compressed air tanks Aug. 20, 1991
4952498 Method and apparatus for detecting microorganism activity Aug. 28, 1990
4915879 Signal coupling for humidifier container Apr. 10, 1990
4899740 Respirator system for use with a hood or face mask Feb. 13, 1990
4856564 Indicator assembly Aug. 15, 1989
4825802 Pheumatic alarm for respirator May. 2, 1989
4813368 Musical tea kettle Mar. 21, 1989
4778072 Pressure release tamper indicating feature for closure Oct. 18, 1988
4776296 Mounting for audible signal valve knob Oct. 11, 1988
4747364 Flow rate threshold sensor May. 31, 1988
4697643 Temperature-compensated pressure controller, operationally reliable extinguisher provided with such a pressure controller and process for filling such a pressure controller Oct. 6, 1987
4669415 Alarm device for respirators Jun. 2, 1987
4648425 System and method of confirming operation of a steam relieving safety valve for a water-cooled nuclear reactor Mar. 10, 1987
4632052 Tornado early warning device Dec. 30, 1986
4626344 Oil filter restriction sensor Dec. 2, 1986

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