Abstract: The present invention is a new improved wick which is manufactured so as to allow the wick to burn for a longer period of time than existing wicking material. The wick is capable of being moved around the surface of a candle to maximize the life of the candle by burning all of the candle's wax instead of permitting the candle to burn only in the area immediately surrounding the wick as in the case with most conventional wicks. The wick comprises a single strand of tufted wire coil having a polyethylene and wax coating. One end of the coil is turned upward into a vertical section to compose the lighting element and the other end of the wire is wound into a circular base such that it touches the base of the vertical section.
Abstract: A portable landing zone marker which includes a fixture for holding a chemiluminiscent element to provide an illuminated night landing zone for aircraft. The marker also includes a relatively heavy and dense base which enables the marker to resist relatively high winds.
Abstract: A system for preparing specimens in a controlled environment to insure that a liquid or partially liquid specimen is maintained in its original state while it is being prepared, and once prepared the specimen is vitrified or solidified with minimal alteration of its microstructure. The controlled environment is provided within a chamber where humidity and temperature can be controlled precisely while the specimen is prepared. The specimen is mounted on a plunger and a shutter controlled opening is opened substantially simultaneously with release of the plunger so the specimen is propelled through the shutter into an adjacent cryogenic bath.
August 7, 1986
Date of Patent:
June 28, 1988
Regents of the University of Minnesota
Jayesh R. Bellare, Howard T. Davis, L. Edward Scriven, II, Yeshayahu Talmon
Abstract: A light controlling heat collecting solar roof, the roof being formed of sheeting material of generally corrugated form, each corrugation having a generally planar upper surface with a generally planar lower surface at the bottom of the trough, the side walls connecting the upper and lower surfaces being transparent or translucent and one of these being generally vertical and facing the equator. Heat collecting tubes may be mounted on one or both of the generally planar surfaces.
Abstract: A gas-fired device for generating heat for a dwelling, comprising a vessel containing a liquid with an associated burner assembly for heating the liquid, an air-heat exchanger provided on a portion of the circumferential wall of the vessel, means for passing air through the heat exchanger for heating the air and a connection with means for passing the heated air to the room(s) to be heated, and a discharge for the combustion gases extending to the outside. On the remaining portion of the circumferential wall of said vessel a combustion gases-heat exchanger being mounted, so that heat is supplied to the vessel exclusively from the outside. Preferably a cooking assembly is provided above the vessel, and a condenser is mounted in the discharge channel for the combustion gases for pre-heating the air, a discharge conduit for the combustion gases from the cooking assembly being provided which leads also to said condenser.
Abstract: The specification describes a system for initiating and promoting combustion of fuels such as wood, coal, oil, etc. Virtually complete combustion is achieved by feeding combustion air under pressure through openings in a diffuser plate with the diameter of the openings having a calculated size and spacing therebetween. By-products of primary combustion are burned by the system. The specification also describes an exemplary wood stove and a cooking unit which utilizes the novel combustion principle.
Abstract: A valve having a flow path in the form of a Venturi tube having a throttle and flow path sections extending and flaring from the opposite sides of the throttle to an inlet and outlet, respectively, and a cylindrical valve plug provided at the throttle and selectively movable at right angles to the flow path to present a flow path end into the flow path and having a semi-spherical valve head at the flow path end with a notch having a length in the direction of movement of the valve plug less than the diameter of the throttle formed in a portion of the valve head and the remaining portion of the valve head containing a diametrical line connecting opposite portions of the valve head in contact with the wall of the throttle while occupying a major portion of the surface of the valve head facing a flow in the flow path.
Abstract: A petri dish includes a bottom container member having a circumferential groove located in the bottom corner thereof. The groove facilitates the distribution of liquid culture media during the filling operation, assists in retaining the periphery of the solidified media in place to increase shelf-life, and provides a pleasing visual perception as to the media thickness when the petri dish is viewed from the side. The cover member includes an upstanding rib located on a top surface thereof, such that upon stacking the petri dish with another of like construction, the exterior surface of the circumferential groove and the upstanding rib cooperate to facilitate stacking. Also, the respective top and bottom walls of the cover and bottom container being 30% thinner than their associated side wall portions to provide in a savings in fabrication material.
Abstract: This invention provides a portable barbeque having a base and a lid hinged to one another. A pair of allochiral feet are hinged to the bottom of the base and are arranged to lock to the base when deployed to support the base so that there is little likelihood of upsetting the structure. After use, the lid is closed and the feed can be dislodged and folded over the lid to hold the lid closed against the base and to store the feet. This invention also provides a base and a lid and a heat source contained in the base with grill support means inside the base. A shelf is supported in the base and has dividers between sections of the shelf to restrain movement of inert cinders placed on the shelf. A grill also supported by the base is spaced from the shelf such that the cinders are retained by the grill on the shelf should the housing be tilted or turned upside-down.
Abstract: The efficiency of a wood burning stove is enhanced in a number of different ways. The first is a means to first preheat air in the lower part of the airspace in the jacket before the air passes through heat exchange tubes in the firebox. The second is to discharge the hot air in the upper part of the jacketed airspace along with the hot air from the heat exchange tubes into the enclosure to be heated. The third is to deflect the discharged hot air downward to decrease the temperature differential from floor to ceiling in the enclosure being heated. The fourth is to deflect the fire and hot gasses from the firebox away from the flue so that they must pass parallel in heat exchange relationship with the top of the stove before they can enter the flue. A fifth is to provide a second grate below the heat exchanger tubes, which act as a first grate, to catch burning embers which fall between the tubes of the first grate and provide complete combustion of the embers.
Abstract: An oil burner of the air atomizing or vaporizing pot type has means to supply oil and combustion air to a combustion chamber adjacent a fluid chamber which receives heat therefrom. Heated fluid is removed from and cooler fluid supplied to the fluid chamber. Control means operate to vary the supply of air and oil dependent on the temperature of the heated fluid leaving the fluid chamber or on the temperature difference between the heated fluid and the cooler fluid.
Abstract: A heating system comprising a firebox defining a combustion chamber that is substantially sealed from the atmosphere. The system includes a flue for conducting combustion gases from the combustion chamber. A first duct surrounds the flue and defines an inner passageway with respect thereto. A second duct surrounds the first duct and defines an outer passageway. An inlet means is provided for introducing ambient air into the outer passageway. The air in the outer passageway is drawn through the inner passageway by a negative pressure in the combustion chamber. The ambient air in the inner and outer passageways is heated by heat transmitted from the flue. This heated ambient air is then introduced in the combustion chamber to improve the efficiency of combustion.
Abstract: A wick for use in a burning appliance consisting of (A) a fuel absorbing section composed of a plurality of short fiber web layers forming its outermost layers and one or a plurality of long fiber layers of numerous long fibers aligned substantially in one direction and (B) a heat-resistant burning section adjacent to the fuel absorbing section. The long fiber layers and the short fiber web layers are physically united into an inseparable integral structure by, for example, needle-punching or stitch-bonding. The wick has a high rate of fuel absorption and permits burning of a fuel at a high caloric output.
Abstract: A system and protocol for performing cytotoxicity studies including apparatus and methods for culturing the biopsied cells, for providing oxygenated nutrients, for removing cell-waste products, for introducing a fluorogenic substrate, for introducing cytotoxic agents including anticancer drugs, for measuring the released fluorescence and for measuring intracellular accumulation of fluorescein. Cytotoxicity can be determined by measuring fluorescence in the efflux of the vessel and concommitantly by direct photometric comparisons of the cells in the vessel before and after exposure to the cytotoxic agent.
Abstract: There is provided a wind lantern including a container for holding a can filled with liquid wax, the can having on its top side a small tube with a wick extending into the can serving as the burner, and a glass globe adapted to be placed on the container. The wind lantern further includes a detachable base disposed on the bottom end of the container, the base having an outer step extending therearound and a center core provided with a center bore, so that for transport of the wind lantern, the base can be attached to the top edge of the container between the glass globe and the can filled with liquid wax, so as to seal the can.
Abstract: An apparatus for dispensing a liquid basting sauce includes an elongated sauce delivery tube having multiple spray nozzles suspended in spaced relationship along the length of the tube. The sauce delivery tube is mounted on the barbecue grill in a position above the food being cooked or, alternatively, intermediately between the food and the firebox. Connected to one end of the delivery tube is a pressurized sauce supply bottle which contains the selected basting sauce. A timer-controlled injection valve connects the sauce supply bottle to the delivery tube, and upon activation of the valve by the selected timer device, sauce is injected under pressure into the tube and dispensed through the spray nozzles.
Abstract: A valve for a surf pool having a frame of generally horizontal and vertical members, a leg pivotally attached to the higher horizontal member, a foot at the end of the leg for opening and closing the valve and an actuator mounted on the lower horizontal member for pivoting the leg. The foot may include oblique surfaces for reducing its drag and for enhancing the seal between the foot and a valve throat in response to hydrostatic pressure on the foot.
Abstract: A gas burner comprises a ceramic tube or nozzle through which a gaseous fuel flows, a chamber surrounding the ceramic tube, and means for delivering preheated combustion air to the chamber. The tube is made of an insulating ceramic in order to insulate the fuel from the preheated air. The inner portion of the tube comprises an insulating ceramic having lower thermal conductivity than that of the outer portion.
Abstract: A portable chemical heater for cooking or warming food, the heater including a can filled with diethylene glycol fluid. The can is provided at its top with a protruding neck that is normally closed by a removable cap. Seated within the neck is a cup-shaped sealing insert having a bore therein through which projects the upper end of a wick. This wick is formed by a bundle of glass fibers, the remaining portion of the wick extending into the can and being immersed in the fluid.
Abstract: The burner comprises a body for receiving gas and a plurality of spaced apart burner elements fixed to the body in a substantially gas tight manner. The elements locate in slots in the body with a slotted intermediate member arranged between the body and the element. Each of the elements has marginal portions which project through associated slots in the body and intermediate member. The portions are deformed so as to interconnect the body and the burner.