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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7891572 | Temperature and low water monitoring for boiler systems A dual functionality temperature control measurement and low water cutoff measurement system is taught within a single tapping to a boiler. This dual functionality combines a low water cutoff and temperature sensor into one control utilizing a sensing element suitab... | 02/22/2011 |
| 7340509 | Reconfigurable appliance control system A reconfigurable appliance control system includes a dedicated appliance control (DAC) for controlling operation of an appliance. The system further includes an appliance communication control (ACC) for communicating with at least one appliance. The system includes ... | 03/04/2008 |
| 7191039 | Controller for fuel fired heating appliance A controller for a fuel-fired appliance comprising a microprocessor that is able to detect an interruption in power, and immediately store errors and historical diagnostic information in a non-volatile memory before the microprocessor powers down. Upon restoration o... | 03/13/2007 |
| 7090140 | Method and device for monitoring burners The invention relates to a device and a method for monitoring burners using an automatic heating machine (1) for controlling or regulating the burner (15), and a temperature controller (5). At least the flow/boiler temperature (T?VL?) is detecte... | 08/15/2006 |
| 7020543 | Controller for fuel fired heating appliance A controller for a fuel-fired appliance comprising a microprocessor that is able to detect an interruption in power, and immediately store errors and historical diagnostic information in a non-volatile memory before the microprocessor powers down. Upon restoration o... | 03/28/2006 |
| 6976636 | Heater having over temperature shut off control A heater is provided with an accurate shutoff device that shuts off (de-energized) the heater upon detecting an over temperature condition. The heater includes a body for holding material (water) to be heated and a first heating element coupled to the body for heati... | 12/20/2005 |
| 6728600 | Distributed appliance control system having fault isolation An appliance controller suitable for controlling a heating appliance (e.g., gas-fired water heating apparatus) having a distributed control system. The distributed control system includes a host computer and one or more heating control units. In accordance with a pr... | 04/27/2004 |
| 6129284 | Integrated appliance control system A fully integrated electronic appliance controller for controlling the operation of a appliance (e.g., a gas-fired water heater or boiler). The controller includes an integrated intelligent control system; enhanced safety features including an igniter cur... | 10/10/2000 |
| 5838243 | Combination carbon monoxide sensor and combustion heating device shut-off system A new Combination Carbon Monoxide Sensor and Furnace Shut-Off System for automatically terminating natural gas flow to a malfunctioning boiler or furnace which is producing dangerous levels of carbon monoxide. The inventive device includes a carbon monoxi... | 11/17/1998 |
| 5836511 | Solar hot water heating system A liquid temperature regulation system comprises a controller means adapted to control operation of a temperature regulation means. A sensing means to detect the liquid temperature and a safety means to enable the temperature regulation means to be disabl... | 11/17/1998 |
| 5520327 | Electronic thermostat having safety feature An electronic thermostat having a safety feature includes a controller which sends control signals to circuitry used for activating a system for conditioning air. The control signals are used to control the active state of the system for conditioning air.... | 05/28/1996 |
| 5451929 | Smoke alarm and air cleaning device An air cleaner with a smoke alarm unit for a forced air recirculating system is disclosed. The smoke alarm unit is housed within a module that fits within the frame of the air cleaner with minimal impact on the cleaning ability of the cleaner. In a prefer... | 09/19/1995 |
| 4986468 | Test circuit for system monitoring apparatus A gas fired burner includes a pilot gas valve and a burner gas valve sequentially operated to light the burner. A monitor includes individual monitoring of the status of the valves and the burner as well as other components and systems associated with the... | 01/22/1991 |
| 4984736 | Heater for motor vehicles which can be operated on several power settings By temperature gradient detection it is determined for the liquid combustion chamber auxiliary heater for motor vehicles, whether e.g. a flame blow-off has taken place, which has to be interpreted as a malfunction and hwich necessitates the discontinuatio... | 01/15/1991 |
| 4818970 | Fire condition detection and control system for air moving and filtering units A fire condition detection and control system for use with air moving and filtering units. The system includes one or more remote fire condition detection units, which sense heat or smoke and, upon such sensing, transmit a signal indicative of an alarm co... | 04/04/1989 |
| 4750452 | Water heater An instantaneous hot water heater having a coiled heat exchanger (4) through which water to be heated passes. A fuel supply assembly (22) is provided for supplying air and gas to the interior of the exchanger for combustion in such a way that combustion o... | 06/14/1988 |
| 4726514 | Heating device A heating device, particularly an auxiliary vehicle heating device, in which there are disposed, a first temperature sensor at the inlet, and a second temperature sensor at the outlet of the heating device. The outputs of the two temperature sensors are c... | 02/23/1988 |
| 4598668 | Apparatus for efficiently controlling the operation of parallel boiler units There is disclosed a control apparatus for operating any one of a plurality of parallel connected boilers as a lead boiler, with the others operating as lag boilers. The control apparatus enables a lag boiler to assist the lead boiler during a prolonged o... | 07/08/1986 |
| 4429682 | Automatic safety gas heating device A valve rod of a gas heating device actuates not only a microswitch, but also a disc valve. A pilot burner and a main burner are separately controlled by individual solenoid operated valve which is serially connected. The disc valve is provided at the ups... | 02/07/1984 |
| 4375273 | Combustion automatic control system The invention is with respect to a fail-safe system for stopping damage to water boilers, whose thermostats are not in working order. In an automatic combustion control system of the sort having an elastic thermostat bellows element placed within an outer shel... | 03/01/1983 |
| 4374506 | Automatic flue gas heat recovery system An automatic flue gas heat recovery system for supplementing or replacing a conventional, separate hot water system. In the example described, the heat recovery system is applied to a pizza restaurant where large quantities of heat energy are normally was... | 02/22/1983 |
| 4367845 | Automatic temperature control system for diver heating system In a diver heating system of the type in which a fluid being circulated in he circulation passage of the diver's clothing is heated by the controlled combustion of a reducing metal in an oxygen atmosphere, a temperature control system in which a gas flow c... | 01/11/1983 |
| 4295604 | Automatic temperature control system for diver heating system In a diver heating system of the type in which a fluid being circulated in he circulation passage of the diver's clothing is heated by the controlled combustion of a reducing metal in an oxygen atmosphere, a temperature control system in which a gas flow c... | 10/20/1981 |
| 4240579 | Thermostatically controlled heating system Efficiency of domestic heating systems is improved by a flue temperature responsive switch for intermittently shutting down the burner when temperature conditions are such as would cause extended operation of the burner in the absence of the switch. The t... | 12/23/1980 |
