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Reward Candy Dispenser for Personal Computers
A personal computer peripheral, battery powered reward candy dispenser which immediately presents students with a single candy for each problem completed correctly.
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| Number | Title | Issue Date |
| 7783175 | Liquid heat-cooking device A fryer is set up in a cooking area of a restaurant or the like for use, and allows a standby temperature of cooking oil to be switched according to congestion of customers in a hall of the restaurant. The congestion of customers is evaluated by counting per unit ti... | 08/24/2010 |
| 7225629 | Energy-efficient heat pump water heater An energy-efficient heat pump water heating system determines whether to energize a heat pump by interpreting readings from one or temperature sensors based on two thresholds. The heat pump is energized if the detected temperature falls below a first threshold and d... | 06/05/2007 |
| 7032542 | Apparatus and methods for controlling a water heater A gas-powered water heater includes means for stepping down a line voltage from a receptacle remote from the tank, means for using the stepped down voltage to provide a low voltage, and means for using the low voltage to sense conditions pertaining to the heater and... | 04/25/2006 |
| 6877503 | Hybrid cooking range burner with removable gas and radiant heat subassemblies Burner assembly for a cooking range is provided. The burner assembly includes a gas-heat subassembly, and a radiant heat subassembly. An electromechanical interface is configured to detachably interconnect the subassemblies to one another. The electromechanical inte... | 04/12/2005 |
| 6640047 | Hybrid water heater with electrical heating unit and combustor In a hybrid water heater, a heat pump unit and a combustion heating unit are combined for heating water to be stored in a hot water tank. The combustion heating unit includes a combustor for heating water in a chamber by combustion operation. The chamber ... | 10/28/2003 |
| 6058245 | Electric boost heater for deep fryer A fryer system having a vat containing shortening, a first heater for supplying heat to the shortening, and a second heater for supplying heat to the shortening. The second heater is preferably activated only when the temperature of the shortening falls b... | 05/02/2000 |
| 5960157 | Recreational vehicle water heater having centrally controlled gas and electric power sources A water heater for a recreational vehicle which employs both gas and electric powered system for heating the water within the water heater, wherein both the gas powered and electric powered systems are controlled through a single user interface control. T... | 09/28/1999 |
| 5495551 | Fast recovery circuit for heat pump water heater An external circuit that works in conjunction with the existing tank thermostatic controls to control both a water heating heat pump and the existing resistance elements in a water heater. The existing resistance elements are disabled to allow the heat pu... | 02/27/1996 |
| 5367602 | Control apparatus and method for electric heater with external heat source A water heating system, including both a conventional water heater and an external heat source such as a heat pump, is controlled in accordance with the present invention. The water heater includes a water storage tank, an electrically resistive heating e... | 11/22/1994 |
| 5255338 | Heat pump water heater control circuit An external circuit that works in conjunction with the existing tank thermostatic controls to control both a water heating heat pump and the existing resistance elements in a water heater. The existing resistance elements are disabled to allow the heat pu... | 10/19/1993 |
| 5220807 | Combined refrigerator water heater A combined refrigerator-water heating system providing one or more insulated food storage compartments, includes an insulated water storage compartment, a refrigeration system including a compressor, an evaporation heat exchanger configured to cool the fo... | 06/22/1993 |
| 5190025 | Motor vehicle drinking water warming and heating device A drinking water warming and heating device, comprising a housing having a storage chamber inside thereof and a water circulating space set therebetween. Inside the space is a partition which divides the space into an inner and an outer water circulating ... | 03/02/1993 |
| 5133041 | Method and apparatus for transporting commodities, especially liquid commodities, at temperatures above their congealing point in tanks or tank containers, as well as a method and apparatus for cleaning the tanks or tank containers A method and an apparatus for transporting commodities, especially liquid commodities above their congealing temperature in a tanks or tank containers. At least a partial flow of hot exhaust gases of an internal combustion engine of a tank vehicle or tank... | 07/21/1992 |
| 4898151 | High heating efficiency deep fat cooking frypot Cooking oil contained in a fuel-fired deep fat frypot is heated utilizing a recirculating flow of combustion gas produced by an induced flow fuel-air burner. A squirrel cage type centrifugal fan draws a fuel-air mixture inwardly through the burner into an... | 02/06/1990 |
| 4893610 | Liquefied petroleum gas and electric water heater A liquefied petroleum gas (LPG) and electric water heater which includes a water tank, an electric heater and a separate LPG combustion chamber having a plurality of water conduits disposed within the water tank, a control box for changing the source of t... | 01/16/1990 |
| 4818845 | Storage type electric water heater having a closed circulation loop provided with a bubble pump An electric storage type water heater includes a tank having cold water introduced into the lower part thereof and an upper part connected by a hot water supply pipe to a faucet. A bubble pump arranged within an external heat insulator layer enclosing the... | 04/04/1989 |
| 4740673 | Dual control thermostat circuit An external circuit that works in conjunction with the existing tank thermostatic controls to control both a heat pump and existing resistance elements in compliance with existing governmental codes. At the same time, this circuit disables the resistive h... | 04/26/1988 |
| 4661684 | Asphalt heating system An asphalt heating system is comprised of a fuel fired, flue type tank heater, a heat transfer oil system for heating the oil circulated through the plant, and an electric booster heater for heating the oil and for use as a back-up heating means for the t... | 04/28/1987 |
| 4645908 | Residential heating, cooling and energy management system A residential HVAC system includes a heat pump having a compressor arranged to heat a domestic hot water vessel and to heat or cool a storage vessel which is connected to a heat exchanger within the residence. Temperature sensors are provided at critical ... | 02/24/1987 |
| 4604991 | Hot water preheater system A secondary heating source is used to preheat the water supplied to a conventional hot water tank. Three two-position valves permit the water from the water supply line to be supplied directly to the hot water tank during part of the year (such as the win... | 08/12/1986 |
| 4595825 | Thermostatically controlled electric water heater An electric water heater for heating a flow of pool or spa water includes an elongated metallic body of brass, bronze, aluminum or alloys thereof. A lengthwise elongated hollow in the body defines a water flow path having inlet and outlet openings directl... | 06/17/1986 |
| 4587401 | Electric water heating appliance A heating appliance operable with a single heat source to heat both circulating water and water for domestic use includes an upright cylindrical reservoir containing water for household use and having an inlet at its lower end and an outlet at its upper e... | 05/06/1986 |
| 4554966 | Heat-transfer device The present invention relates to heat engineering. The essence of the present invention consists in that a condensation chamber is installed essentially horizontally along the object being heated; the device comprises at least two branch pipes: vapour-flo... | 11/26/1985 |
| 4543468 | Control system for water heater with external heat source A control system for an electric domestic water heater operatively associated with an external heat source, such as a heat pump, and including a water storage tank having an internal electric heater unit controlled by a tank thermostat responsive to the w... | 09/24/1985 |
| 4540874 | Control system for electric water heater with heat pump external heat source A control system for an electric water heater operatively associated with an external heat source, such as a heat pump. The water heater includes a water storage tank provided with an electric tank heating unit having a tank thermostat which closes in res... | 09/10/1985 |
| 4532413 | Steam generator heated by combination of electric heat and condensation of contaminated process steam A steam generator assembly, particularly for use in connection with the mechanical preparation of pulp, for generating pure steam required in a subsequent process, such as drying of proper in a paper machine, by utilizing the condensation heat of contamin... | 07/30/1985 |
| 4296799 | Solar water tank and method of making same A solar water tank for use in solar heating systems includes an insulated tank with flow systems comprised of a plurality of inlet and outlet tubes, heat exchangers, level switch and supplemental heating element, all assembled together with the manway cov... | 10/27/1981 |
| 4261333 | Solar heat exchanger A solar heating panel apparatus has a supporting base with a plurality of elongated heat exchanger members mounted to the base. Each heat exchanger is operatively connected to one end of an adjacent heat exchanger to provide a continuous path through the ... | 04/14/1981 |
| 4240362 | Boiler for domestic heating systems A compact rectangular boiler for hot water heating systems serves as a booster or helper boiler but can be used in some cases as a primary boiler. A boiler power module consisting of fire tubes and a surrounding water chamber is readily removable like a s... | 12/23/1980 |
| 4236548 | Apparatus for providing instant hot water A control system for providing instant hot water at a hot water tap comprising a control unit adapted to be interposed in the fluid line between the source of water supply and the hot water tap. A heating unit is also interposed in the fluid line between ... | 12/02/1980 |
| 4232657 | System for use with solar collector A system is provided for use with a solar collector. The system includes a water storage tank having a heat exchange element mounted therein, the tank being connected to one or more solar collectors adapted to heat water circulated through a primary loop ... | 11/11/1980 |
| 4213299 | Heat transfer lens steam turbine This invention relates to a steam turbine system which utilizes a unique heat-absorbing lens-shaped heating plate and boiler for the production of steam.... | 07/22/1980 |
| 4197446 | Energy-saving device for domestic water heaters An energy saving device for use in connection with a heat-insulated storage vessel in a domestic hot-water system is disclosed. When there is no demand for hot water, water contained in the vessel is heated in an electric through-flow heater and circulate... | 04/08/1980 |
| 4173872 | Water heater apparatus A water heater, converted from existing water heaters or in newly designed and manufactured water heaters, having a condenser tube of a refrigeration unit in thermal conductive contact but not intimate contact with the water to be heated, and having a she... | 11/13/1979 |
| 4165732 | Process and apparatus for obtaining hot water by use of solar energy A process and an apparatus for preparation of hot water, using solar energy is set forth. In the process, the water is made to circulate successively in two reservoirs connected in series, and the water is heated from solar energy in one reservoir while t... | 08/28/1979 |
| 4150787 | Method and arrangement for saving energy in preparing hot water for household A method and an arrangement for saving energy in preparing hot water for household, in that warm waste water from bathtub and shower, etc. in the same household is used for preheating by means of a heat exchanger of water from the water distribution syste... | 04/24/1979 |
| 4076011 | Warm air heating and fire-place system A warm air heating system which efficiently and inexpensively combines a fire-place to another warm air heating device or unit to form a balanced warm air heating system and thus efficiently use the heat output of the fire-place. This warm air heating sys... | 02/28/1978 |
| 4073285 | Fluid handling system A typical automatic hot water tank installation has a self-contained source of heat for the water and is provided with external hot water from a solar collector, air conditioning condenser, or other suitable source. An external hot water handling assembly... | 02/14/1978 |
| 4052000 | Solar energy augmented water heating system Solar energy is utilized to augment the heater of a water heating system, such as a domestic hot water system, having a water storage and heating tank by conducting water to the tank through a solar energy storage tank and circulating a heat transport liq... | 10/04/1977 |
| 4044949 | Heat storage system The invention pertains to an automatic heat storage system comprising two cooperating sources of heat, two heat storage vessels, and a heat emitting system, the heat being transferred by a heating medium common for the entire system. Preferably, one of th... | 08/30/1977 |
