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Class Information
Number: 361/178
Name: Electricity: electrical systems and devices > Control circuits for electromagnetic devices > For relays or solenoids > Condition responsive (e.g., external circuit condition) > Fluid (e.g., liquid level, humidity)
Description: Subject matter wherein the initiating device or circuit is responsive to the condition of a fluid (liquid or gas).
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7180720 |
Failure detection device for hydraulic motor and hydraulic drive vehicle |
Feb. 20, 2007 |
| 6926028 |
Water feeder controller for boiler |
Aug. 9, 2005 |
| 6892751 |
System and method for protecting a building |
May. 17, 2005 |
| 6730884 |
Protective circuit for electrical heating element |
May. 4, 2004 |
| 6688329 |
Water feeder controller for boiler |
Feb. 10, 2004 |
| 6675826 |
Automatic flood prevention system |
Jan. 13, 2004 |
| 6662821 |
System and method for closing an existing valve in response to a detected leak |
Dec. 16, 2003 |
| 6584997 |
Overflow prevention mechanism for liquid transfer systems |
Jul. 1, 2003 |
| 6545488 |
Piping fluid decision device and piping fluid control system |
Apr. 8, 2003 |
| 6523562 |
Plumbing flood control system |
Feb. 25, 2003 |
| 6186162 |
Leak detection and shut-off apparatus |
Feb. 13, 2001 |
| 6125870 |
Overflow protection for a washing machine |
Oct. 3, 2000 |
| 6098644 |
Method and apparatus for controlling duty-cycle type solenoid valve |
Aug. 8, 2000 |
| 6024116 |
Valve assembly and acuator operative for automatically shutting off water and gas supplies to a hot water heater upon detection of a water leak |
Feb. 15, 2000 |
| 6017017 |
Process and apparatus for the recognition of the state of a solenoid valve |
Jan. 25, 2000 |
| 6003536 |
Automatic water shut-off valve |
Dec. 21, 1999 |
| 5992443 |
Valve system |
Nov. 30, 1999 |
| 5967171 |
Shut-off system for preventing water damage |
Oct. 19, 1999 |
| 5857482 |
System for control of fluid vessel overflows |
Jan. 12, 1999 |
| 5771178 |
Fail-safe fluid transfer controller |
Jun. 23, 1998 |
| 5694970 |
Safety valve for water supply system |
Dec. 9, 1997 |
| 5632302 |
Overflow protection shut-off apparatus for use with a water heater |
May. 27, 1997 |
| 5632468 |
Control circuit for solenoid valve |
May. 27, 1997 |
| 5553794 |
Sewage handling system |
Sep. 10, 1996 |
| 5514920 |
Fuel dispenser leak detector |
May. 7, 1996 |
| 5467246 |
Arrangement for emulating an H-type relay air valve which is utilized in a railway braking system |
Nov. 14, 1995 |
| 5402815 |
Temperature sensitive water supply shut-off system |
Apr. 4, 1995 |
| 5321578 |
Rain detector for automatic irrigation systems |
Jun. 14, 1994 |
| 5281858 |
Fluid level activated float switch |
Jan. 25, 1994 |
| 5254371 |
Method of manufacturing a capacitive humidity sensor |
Oct. 19, 1993 |
| 5216288 |
Water level control circuit for sump pumps and the like |
Jun. 1, 1993 |
| 5142428 |
Water sensing type power breaker circuit |
Aug. 25, 1992 |
| 5113892 |
Freeze control and drain valve |
May. 19, 1992 |
| 5113308 |
Actuator with a built-in reed switch |
May. 12, 1992 |
| 5102345 |
Safety device for electrical cord sockets |
Apr. 7, 1992 |
| 5029605 |
Fluid vessel overflow system |
Jul. 9, 1991 |
| 5025827 |
Structure of fluid level controller of piping type |
Jun. 25, 1991 |
| 5013891 |
Personal appliance having shock protection circuitry |
May. 7, 1991 |
| 4951169 |
Safety device for an electrical appliance |
Aug. 21, 1990 |
| 4921001 |
Apparatus and method for adapting sensors to an irrigation controller |
May. 1, 1990 |
| 4890007 |
Carpet mat switch |
Dec. 26, 1989 |
| 4875370 |
Apparatus for measuring the contents of a tank |
Oct. 24, 1989 |
| 4865073 |
Liquid level control for refrigeration system |
Sep. 12, 1989 |
| 4850386 |
Soil Moisture monitor |
Jul. 25, 1989 |
| 4809129 |
Liquid level control system for refrigeration apparatus |
Feb. 28, 1989 |
| 4805662 |
Hot water heater failure protection device with solenoid |
Feb. 21, 1989 |
| 4805066 |
Hybrid float switch |
Feb. 14, 1989 |
| 4796658 |
Apparatus for detecting basement water |
Jan. 10, 1989 |
| 4791519 |
Shock protective circuit with electrical latch for small appliances |
Dec. 13, 1988 |
| 4771804 |
Liquid level sensing and control assembly |
Sep. 20, 1988 |
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