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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 |
| 6805236 | Protector for keyless entry device A case for holding, protecting, yet allowing easy linear access to a keyless entry device, the case comprising an open ended enclosure with a springlike element provided to frictionally hold the device securely yet slidably within the case. ... | 10/19/2004 |
| 6582500 | Electrohydrodynamic liquid-vapor separator A device for separating liquid particles from an entraining gas or vapor stream. The device employs mechanical centrifugal forces to concentrate liquid droplets in a limited space for further extraction from the gas flow using an electrical field and an e... | 06/24/2003 |
| 6109283 | Retractable enclosure system A retractable enclosure for moveable areas such as barges or trucks and for stationary areas such as swimming pools and areas which must be covered at one time and open at another time such as those housing telescopes, cranes, reactors, etc. The enclosure... | 08/29/2000 |
| 5971208 | Smart scent dispenser A device and method for delivering an animal attractant scented liquid to a spot on the ground. The device is intended to be positioned on the ground. It employs a flexible walled container with an external gas filled balloon strapped to the container so ... | 10/26/1999 |
| 5765994 | Low oil detector with automatic reset An optical liquid level sensor for distinguishing between the presence of oil and vapor within a compressor crankcase. The sensor has a light transmitting window positioned to interface the crankcase interior and a planar side facing the crankcase exterio... | 06/16/1998 |
| 5438846 | Heat-pump with sub-cooling heat exchanger A reversible compression type refrigeration system is provided having a heating mode and a cooling mode. The system includes a liquid receiver and a liquid refrigerant line for feeding refrigerant to an expansion device. A main service heat exchanger is p... | 08/08/1995 |
| 5421639 | Lifting device for invalids A portable, storable lifting device for invalids. The device includes a jack base having a backwardly inclined jack upright on which is mounted a jack platen including a hook. Forward and rearward facing wheeled legs are provided attached to the jack base... | 06/06/1995 |
| 5411078 | Air and evaporatively cooled heat exchanger and refrigerating system therefor A fluid cooler having contiguous air cooled and evaporative portions and having a heat exchanger common to both portions. The heat exchanger employs a series of straight tubes which traverse both the air-cooled and the evaporative portions. Separate fans ... | 05/02/1995 |
| 5378524 | Friction reducing surface and devices employing such surfaces An improved aerodynamic surface for the exterior of vehicles moving through a gas and vehicles employing such improved surfaces. The improved surface comprises a matrix of dimples or depressions formed into the portions of the surface of the vehicle. The ... | 01/03/1995 |
| 5278426 | Optical liquid level sensor for pressurized systems utilizing prismatic element An optical sensor, having serviceable electronics, for monitoring the level of a liquid within a vessel having an exterior and an interior and for providing an electrical signal on the traverse of the liquid level past the sensor. The sensor comprises a f... | 01/11/1994 |
| 5228149 | Fastening means and method for shower curtain In a tub - shower environment comprising a tub enclosed on three sides by walls and open on the fourth side, where spray from the shower is intended to be retained within the tub - shower enclosure by a flexible shower curtain suspended from a curtain rod... | 07/20/1993 |
| 5219066 | Wall mounted alarm switch with adjustable height actuator A wall mounted alarm switch assembly intended to be positioned at the site of an existing electric circuit includes a remote mechanical actuating mechanism for the switch assembly. The actuating mechanism comprises dual side-by-side manual interfaces or k... | 06/15/1993 |
| 5212965 | Evaporator with integral liquid sub-cooling and refrigeration system therefor An improved refrigeration evaporator having a first heat exchange element including a fluid inlet and a fluid outlet, for cooling a fluid stream traversing the evaporator by evaporating a volatile refrigerant liquid in heat exchange relation to the fluid ... | 05/25/1993 |
| 5200573 | Projectile having a matrix of cavities on its surface An improved aerodynamic surface for the exterior of vehicles moving through a gas and vehicles employing such improved surfaces. The objectives of employing such improved surfaces are reduced air resistance and increased lift. The improved surface compris... | 04/06/1993 |
| 5170639 | Cascade refrigeration system A cascade vapor compression refrigeration system having a high stage and a low stage, each stage having a compressor, evpaorator, condenser and expansion device. The high-stage evaporator is in heat transfer relationship with the low-stage condenser. Ther... | 12/15/1992 |
| 4841973 | Electrical stimulators A portable single or two channel, electrically energized device for applying a series of therapeutic pulse type electrical stimulations to a human body member including individual channel controls for pulse frequency, pulse width and pulse amplitude and c... | 06/27/1989 |
| 4758853 | SLR camera A single lens reflex camera having no flop-up mirror but instead having a focal plane shutter positioned in the same plane that a flop-up mirror would have occupied, with the side of the focal plane shutter facing the lens silvered to act in place of the ... | 07/19/1988 |
| 4658602 | Refrigeration evaporators with pitched top panel The means and method of pitching a refrigeration evaporator toward its drain outlet which includes a top plate of variable thickness. The evaporator is secured to the top plate. When the top plate is secured against the horizontal ceiling, the evaporator ... | 04/21/1987 |
| 4530215 | Refrigeration compressor with pump actuated oil return A compressor having an oil sump, an external oil reservoir, a conduit connecting the bottom of the oil reservoir to the compressor sump, a pump in the conduit for pumping excess oil from the reservoir to the compressor sump, and an overspill from the comp... | 07/23/1985 |
| 4473132 | Fire escape mechanism A device and method for safely removing occupants of multi-story buildings under conditions of fire and catastrophe by allowing one occupant at a time to don a harness attached to the device and safely jump, with his rate of descent controlled so that he ... | 09/25/1984 |
| 4462216 | Non-freeze drain assembly A drain assembly including a drain pipe and a heater oriented to heat the drain pipe, in combination with a defrosting type refrigeration evaporator intended for use within an enclosure whose temperature is maintained lower than the freezing point of wate... | 07/31/1984 |
| 4423601 | Water defrost evaporator with non-uniform water distribution An air cooling evaporator for use in refrigeration systems under conditions where frost is deposited on the cooling surfaces having a drain pan positioned under the cooling surface and a water distributing pan positioned over the cooling surface. The wate... | 01/03/1984 |
| 4373576 | Heating, ventilating and air conditioning system with reversible air flow An air supply and return system for heating and cooling a room, including an air flow loop having a first set of openings positioned high in a wall of the room (high vents) and a second set of openings positioned low in a wall of the room (low vents). The... | 02/15/1983 |
| 4337051 | Self-scoring test with non-disclosed key A scoring form for tests having a series of questions with multi-choice answers. The form provides an answer group for each question. An answer group is a matrix of rows and columns. The number of columns (or matrix elements in a row) is typically equal t... | 06/29/1982 |
| 4325420 | Apparatus for preparing wood for bending A portable extendable inclined boiler having an open and a closed end, for steaming and thereby softening wooden members for later bending including: a low water cutoff utilizing a thermostat mounted on the boiler wall near the heater; a low water cutoff ... | 04/20/1982 |
| 4277953 | Apparatus and method for distributing volatile refrigerant A distributor for volatile refrigerant having a single inlet and many outlets and designed to distribute refrigerant substantially uniformly to each outlet, has its outlets manifolded together in groups to provide equal refrigerant distribution to a few r... | 07/14/1981 |
| 4152900 | Refrigeration cooling unit with non-uniform heat input for defrost A cooling unit for refrigeration systems having a substantially vertically disposed air cooling element, utilizing either a volatile or a non-volatile refrigerant, upon which element frost accumulates during the course of the refrigeration process. The el... | 05/08/1979 |
| 4137057 | Refrigerating systems with multiple evaporator fan and step control therefor A refrigeration system for cooling air having an evaporator; a compressor; a control for establishing ON periods and OFF periods of the compressor; at least two motor-driven fans positioned to force air over the evaporator; and a control system for the ev... | 01/30/1979 |
| 4102151 | Hot gas defrost system with dual function liquid line A compression type refrigeration system including at least one frosting evaporator positioned to refrigerate air. The evaporator has a liquid refrigerant inlet to which is connected an expansion valve. The evaporator also has a hot gas inlet; a liquid lin... | 07/25/1978 |
| 4095438 | Refrigeration system with hot gas defrost A refrigeration system having compressor and condenser adapted for operation in ambients above approximately 45° F (7° C) and including a frosting evaporator. The evaporator is defrosted by hot gas which flows through the compressor discharge, the conde... | 06/20/1978 |
| 4083195 | Refrigerating and defrosting system with dual function liquid line A compression type refrigeration system including at least one frosting evaporator positioned to refrigerate air. The evaporator has a liquid refrigerant inlet to which is connected an expansion valve. The evaporator also has a hot gas inlet; a liquid lin... | 04/11/1978 |
| 4068493 | Suction accumulator for refrigeration systems A suction accumulator for refrigeration systems having a tank with an inlet fitting for conveying it to refrigerant vapor from the evaporator which is mixed with oil and at times with liquid refrigerant. The tank has an outlet fitting for conveying away t... | 01/17/1978 |
| 4068494 | Power saving capacity control for air cooled condensers A refrigerant flooding type capacity control for air cooled condensers used in compression type mechanical refrigeration systems where the liquid receiver is located in a bypass around the condenser so that the controlled heating, which is applied to the ... | 01/17/1978 |
| 4053725 | Pressure switch for outdoor refrigeration systems A pressure switch for use in refrigeration systems which includes a restrictor to minimize the effect of compressor pulsations on the pressure sensing element and a heater positioned to warm the interior of the switch housing and to maintain the fluidity ... | 10/11/1977 |
| 4037427 | Refrigeration evaporators with ice detectors A refrigeration evaporator with a drain pan which contains a heated temperature sensitive element for distinguishing between the abnormal condition of water or ice in the drain pan and the normal condition of cold air there. The distinguishing action of t... | 07/26/1977 |
| 3994142 | Heat reclaim for refrigeration systems A refrigeration system which has two condensers located in different environments and intended for use alternately, a valve arrangement for determining which of the two condensers is to be operative for rejecting heat and which is to be inoperative, which... | 11/30/1976 |
| 3992895 | Defrost controls for refrigeration systems A defrost control system for the defrosting evaporators of a refrigeration system which utilizes a first timer which runs continuously and attempts to initiate evaporator defrost at predetermined times and a second timer which accumulates compressor opera... | 11/23/1976 |
| 3959979 | Dual voltage forced air heat exchanger This patent describes forced air heat exchangers using single phase A. C. motors to drive their fans and a method of securing high and low speed operation of the motors by connecting them alternately in delta and wye across a 3-phase power supply.... | 06/01/1976 |
