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| Number | Title | Issue Date |
| 7435929 | Methods for monitoring or controlling the ratio of hydrogen to water vapor in metal heat treating atmospheres Methods for monitoring a heat treating atmosphere supply a preselected gas atmosphere at a preselected temperature to a heat treating furnace. The preselected temperature is not greater than a temperature at which wustite (FeO) forms. The methods sense the preselect... | 10/14/2008 |
| 7411163 | Device for providing a melt The invention relates to a device (1) for providing a melt, in particular a plastic melt. Said device (1) comprises a feed unit (2) for material components, at least one purification unit (4) for the flowing melt, in particular a rotatabl... | 08/12/2008 |
| 7297907 | Means and method of maintaining a constant temperature in the magnetic assembly of a magnetic resonance device The present invention discloses a novel active insulation device and method for thermally shielding an external body from temperature fluctuations of a contained body. The method comprising providing an active thermal insulation envelope between the contained body a... | 11/20/2007 |
| 7193189 | Systems and methods for monitoring or controlling the ratio of hydrogen to water vapor in heat metal treating atmospheres Systems and methods for monitoring a heat treating atmosphere derive from at least one sensor placed in situ in the atmosphere a process variable, which is indicative of the ratio of gaseous hydrogen H2 (g) to water vapor H2O (g) in the atmosph... | 03/20/2007 |
| 7100598 | Steaming device and system for residential ovens A steamer device and system for a residential oven is shown for creating steam for the purpose of baking having a steamer insert having a bottom surface for resting on a rack in the oven, the steamer insert having, in sequence, a first chamber, a dam device and a se... | 09/05/2006 |
| 7053341 | Method and apparatus for drum level control for drum-type boilers A method for controlling the level of a drum in a drum-type boiler includes adjusting a gain of a drum level PID (such as a Proportional Integral Derivative control) in accordance with a signal representative of a set of tuning constants, a signal representative of ... | 05/30/2006 |
| 6894253 | Device for controlling the service loads of an electric household appliance, in particular a refrigerator A control unit (3) for controlling an electric household appliance, e.g. a refrigerator, is connected in series with a positive temperature coefficient (PTC) resistive unit (4) which, when supplied with electric current, generates sufficient heat to ac... | 05/17/2005 |
| 6795644 | Water heater A water heater including a water tank, a water inlet line for adding water to the water tank, a water outlet line for withdrawing water from the water tank, at least one electric resistance heating element extending into the water tank to heat water in the water tan... | 09/21/2004 |
| 6766835 | Tank monitor system A hot water tank monitoring system is designed to shut off the water supply to the hot water tank and to shut off either the electrical supply or the gas supply to the heating unit of the hot water tank in response to sensing of malfunction of one or more of a numbe... | 07/27/2004 |
| 6744022 | Systems and methods for monitoring or controlling the ratio of hydrogen to water vapor in metal heat treating atmospheres Systems and methods for monitoring a heat treating atmosphere derive from at least one sensor placed in situ in the atmosphere a process variable, which is indicative of the ratio of gaseous hydrogen H2 (g) to water vapor H2O (g) in the atmosph... | 06/01/2004 |
| 6051819 | Method and device for temperature control of hot tap-water A method and a device for controlling the temperature of hot tap-water, which is heated on the secondary side of a heat exchanger. In order to achieve a quick response and a good temperature stability, the changes of the temperature and the flow of the ho... | 04/18/2000 |
| 6002114 | Control device for an electric water heater A control device installed in an electric water heater to control its operation, the control device including a water temperature control circuit and a power control circuit, the water temperature control circuit being formed of a water temperature detect... | 12/14/1999 |
| 5968395 | Bistable actuator with two thermal actuating elements electrically operated independently of one another or multiposition setting of the device A simple, low-cost, reliable thermoactuator device is described, being capable of taking a plurality of stable working position besides its rest position. One and the same body is associated with at least two thermoactuators whose arrangement is such as t... | 10/19/1999 |
| 5948304 | Water heater with proportional band temperature control for improved thermal efficiency A water heater having a water tank and a electric resistance heating element extending into the water tank for heating water in the tank. The water heater includes a proportional band temperature controller for conducting electric power to the electric re... | 09/07/1999 |
| 5948303 | Temperature control for a bed A temperature control apparatus for a bed includes at least one heating element, mounted in a resting surface on a mattress of the bed for warming at least a first are(a of the resting area. A temperature sensor is located to detect the temperature of the... | 09/07/1999 |
| 5880438 | Steam sterilization apparatus and control system A steam sterilization apparatus (10) includes an electronic control system having a main control circuit (C) including a central processing unit (68), an input device (36), and output devices (24,28) provided on a single circuit board (22) which is attach... | 03/09/1999 |
| 5839357 | Electric pressure cooker Disclosed is an electric pressure cooker. The electric pressure cooker's food container is locked to its lid by using a driving power of a motor. The inner pressure state of the container can be monitored from the outside, and is automatically discharged ... | 11/24/1998 |
| 5829069 | Jet bath having multiple accessories A jet bath designed to use minimum water, to use a formed in place low cost waterfall type water inlet, to have pulsating and massaging air-water jets appropriately located in the tub, to allow user adjustment of water temperature, to prevent heating the ... | 11/03/1998 |
| 5821502 | System for providing in-situ temperature monitoring and temperature control of a specimen being exposed to plasma environments A housing provides temperature monitoring and temperature control of a specimen, while the specimen is being exposed to plasma environments for in-situ reactivity studies or other plasma processing purposes. The housing is adaptable for use with a tempera... | 10/13/1998 |
| 5500509 | Microprocessor based universal digital pressure sensor A pressure sensing oscillator (12) and temperature sensing oscillator (14) each produce digital, oscillating signals having frequencies varying with respect to the pressure and temperature, respectively, sensed by each. The signals are input into a temper... | 03/19/1996 |
| 5129034 | On-demand hot water system An on-demand electric water heater includes at least one heating chamber having an electric heating element operatively positioned between a cold water inlet and a hot water outlet. The heating elements are controlled by pressure sensing switches activate... | 07/07/1992 |
| 5097114 | Low-voltage heating device A low-voltage electric heating device for application in a carburizing furnace is provided with an outer housing or sleeve for replaceable disposition within the furance, the outer housing radiating heat directly into said furnace; at least one current pa... | 03/17/1992 |
| 5086213 | Device for detecting, during welding, variation in the physical state of the plastic material in a coupling piece of joining pipes The invention concerns a device for detecting variations in the physical state of the plastic material in a coupling piece used for welding pipes and incorporating a heating resistor, cavities which the softened material can enter and sensors for detectin... | 02/04/1992 |
| 5083011 | Air heater with safety control circuit An air heater with a safety control circuit is disclosed. A heat source is mounted within a hollow housing having an air inlet end and an air outlet end. The heat source is actuated in response to the presence of a heat control signal. The heat control si... | 01/21/1992 |
| 4954693 | Ventilation regulated hot air supplied constant temperature oven A ventilation regulated hot air supplied constant temperature oven used for heat aging testing. Heated air of a predetermined temperature is supplied to a test oven body through an air supply port. Ventilation of the test oven is carried out through the a... | 09/04/1990 |
| 4873553 | Variable pressure controls of fixing device in electrophotographic copying machine A variable pressure control of fixing device, which includes a fixing roller and a compression roller in contact with each other and serves to fix a toner image on a transfer sheet by passing this sheet between these rollers, comprises a coil spring havin... | 10/10/1989 |
| 4828166 | Device for regulating the heating element of a cooking vessel A device for regulating the heating element of a cooking vessel of the type with an input device for setting a preselected cooking temperature in the range of the boiling point of water, a device for measuring the temperature on or in the cooking vessel, ... | 05/09/1989 |
| 4825047 | Temperature-responsive controller for waterbed mattress heaters A controller for an electric resistance waterbed mattress heater supplied with electric current by an elongate power cord extending between the heater and a power service outlet. The controller includes a small diameter elongate cylindrical housing in whi... | 04/25/1989 |
| 4814583 | Temperature controller for a waterbed A temperature controller for controlling an electrical heater of a bed maintains the bed at a predetermined set temperature and additionally, over a long period of time, acts to vary the set temperature to compensate for variations in the temperature of t... | 03/21/1989 |
| 4777346 | Electrically heated therapeutic pillow A liquid or gel filled pillow utilized for therapeutic purposes is formed from a pair of flexible casing of plastic or the like, one within the other, and being separated by a compressible electrically conductive foam material having a high resistance in ... | 10/11/1988 |
| 4720623 | Power control device for a resistance heater in an oven A power control device for controlling power to a resistance heater in an oven uses a microprocessor, temperature measuring circuit, power measuring circuit, a triac circuit for firing the heater, a power phase synchronizer whereby the microprocessor sync... | 01/19/1988 |
| 4484062 | Heater structure An electric heater structure designed to be used as an auxiliary water heater for showers, sinks and the like includes a housing defining a water heating chamber having an inlet for connection to a water supply pipe and an outlet for discharging heated wa... | 11/20/1984 |
| 4404460 | Controllably heated clothing Heated clothing includes: (a) multiple clothing sections adapted to cover different portions of the human body, (b) electrical wires carried by such sections and including bus wires and heater wires, and (c) circuitry for controlling battery powered electrical... | 09/13/1983 |
| 4371779 | Energy saving water heater control circuit An energy saving control circuit for a water heater having a hot water storage tank provided with an electrically operated heater, i.e., an electric heater or an electrically controlled combustion burner, includes a water flow detection device associated ... | 02/01/1983 |
| 4343987 | Electric boiler An electric boiler includes a conductivity control having a controller responsive to both steam pressure and electrode current. The controller is operative to open a boiler feed water discharge valve when either the steam pressure or electrode current fal... | 08/10/1982 |
| 4331856 | Control system and method of controlling ion nitriding apparatus A control system and method for an apparatus to glow discharge treat (such as ion nitride) a workpiece. The apparatus includes a housing to receive a workpiece and a low pressure atmosphere of ionizable gas (nitrogen and hydrogen for nitriding), and conne... | 05/25/1982 |
| 4322593 | Apparatus for pre-heating resin tablet An apparatus for pre-heating resin tablets comprising a resin tablet heater, a switch for setting a reference softening degree and a softening degree detector for the resin tablet. The detector includes a pressure source and a pressure transmitting member... | 03/30/1982 |
| 4298022 | Energy saver control for outdoor water heater An energy saver control system for prevention of water freezing in an outdoor tank, such as a stock tank, which involves a conventional type of water level control valve to maintain a selected level of water in the tank, and an electrical switch which is ... | 11/03/1981 |
| 4288685 | Flow-activated resistance heater for water A flow-activated water heater includes a body defining water inlet chamber communicating with a heating chamber containing an electric resistance heater through an intermediate flow duct. A movable piston supported by a flexible membrane and provided with... | 09/08/1981 |
| 4211251 | Automatic purging system A system for automatically purging heating mantles and other apparatus including an enclosed volume capable of low level pressurization. The system comprises a pressure sensor for sensing the fluid pressure within the enclosure, which may be the space bet... | 07/08/1980 |
