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Class Information
Number: 122/504.2
Name: Liquid heaters and vaporizers > Safety devices > Alarms or indicators
Description: Subject matter which operate an alarm or indicator should dangerous conditions arise in the boiler, usually by a thermally-operated means which is exposed to the steam when the water-level falls below a certain limit.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7167813 |
Water heater performance monitoring system |
Jan. 23, 2007 |
| 6688329 |
Water feeder controller for boiler |
Feb. 10, 2004 |
| 6675826 |
Automatic flood prevention system |
Jan. 13, 2004 |
| 6561138 |
Water heater with a flame arrester |
May. 13, 2003 |
| 6520122 |
Pressurized steam boilers and their control |
Feb. 18, 2003 |
| 6325535 |
In-situ radiant heat flux probe cooled by suction of ambient air |
Dec. 4, 2001 |
| 6186162 |
Leak detection and shut-off apparatus |
Feb. 13, 2001 |
| 6135133 |
Water-heater containment and warning device |
Oct. 24, 2000 |
| 5992443 |
Valve system |
Nov. 30, 1999 |
| 5979372 |
Method of sensing malfunctions of a water supply system for a boiler and apparatus thereof |
Nov. 9, 1999 |
| 5881762 |
Base-surround retrofit enclosure assemblies for containing leakage |
Mar. 16, 1999 |
| 5857482 |
System for control of fluid vessel overflows |
Jan. 12, 1999 |
| 5632302 |
Overflow protection shut-off apparatus for use with a water heater |
May. 27, 1997 |
| 5280802 |
Gas appliance detection apparatus |
Jan. 25, 1994 |
| 5188143 |
Water leakage detection device |
Feb. 23, 1993 |
| 5101774 |
Acoustic leak detection system |
Apr. 7, 1992 |
| 4974550 |
Accumulator with sensor through rollers |
Dec. 4, 1990 |
| 4960079 |
Acoustic leak detection system |
Oct. 2, 1990 |
| 4936376 |
Synthetic gas cooler with thermal protection |
Jun. 26, 1990 |
| 4905632 |
Safeguard arrangement for plant |
Mar. 6, 1990 |
| 4901678 |
Heating boiler and method for operating same |
Feb. 20, 1990 |
| 4876987 |
Synthetic gas cooler with thermal protection |
Oct. 31, 1989 |
| 4805662 |
Hot water heater failure protection device with solenoid |
Feb. 21, 1989 |
| 4615302 |
Convection section ash monitoring |
Oct. 7, 1986 |
| 4603660 |
Convection section ash monitoring |
Aug. 5, 1986 |
| 4598668 |
Apparatus for efficiently controlling the operation of parallel boiler units |
Jul. 8, 1986 |
| 4572113 |
Water leak control circuit |
Feb. 25, 1986 |
| 4569312 |
Hot water tank warning system |
Feb. 11, 1986 |
| 4556019 |
Convection section ash monitoring |
Dec. 3, 1985 |
| 4552098 |
Convection section ash monitoring |
Nov. 12, 1985 |
| 4531479 |
Monitor system for vertical boilers |
Jul. 30, 1985 |
| 4514096 |
Furnace wall ash deposit fluent phase change monitoring system |
Apr. 30, 1985 |
| 4462339 |
Gas cooler for production of saturated or superheated steam, or both |
Jul. 31, 1984 |
| 4433646 |
Boiler water trip system |
Feb. 28, 1984 |
| 4408568 |
Furnace wall ash monitoring system |
Oct. 11, 1983 |
| 4263587 |
Liquid level control system |
Apr. 21, 1981 |
| 4256258 |
Temperature monitor and alarm system |
Mar. 17, 1981 |
| 4196341 |
System for monitoring the operation of an electric boiler |
Apr. 1, 1980 |
| 4137965 |
Waste heat recovery system |
Feb. 6, 1979 |
| 4135079 |
Tank heater alarm |
Jan. 16, 1979 |
| 4070992 |
Boiler blow down controller |
Jan. 31, 1978 |
| 4023164 |
Heat detection and alarm system |
May. 10, 1977 |
| 4007713 |
Test circuit |
Feb. 15, 1977 |
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