Abstract: A module useful for forming a foundation for a dental prosthesis, the module including at least one each of (a) a post and (b) an extension unit, the post having a threaded end adapted to anchor the post into rigid dental materials such as tooth stubs or bone matrix, and a second retaining end for engaging the extension unit. The extension unit comprises an engaging end to engage the retaining end of the post, and one or two leaves extending from the engaging end transversely from the post. The engaging end is so sized and shaped as to maintain a sloppy fit with the retaining end of the post. The sloppy fit permits a minor, constrained degree of rotation of the extension unit with respect to the post. At least two such modules can be used to form the foundation for a rigid prosthetic dental bridge; at least one of the extending leaves on each module is so formed as to be capable of coupling with one of the extending leaves on a second such module.

Abstract: Display apparatus includes at least two longitudinally extending members for operation in a vertical position, including at least four panel holders with two each of the holders secured to each member. A panel is held at its corners by each holder to extend between the longitudinally extending members. The panel holders include a facing pair of substantially rigid plates having substantially flat opposing surfaces, a rigid member separating and interconnecting the plates, including dividing protrusions to divide the volume between the plates into segments. A clamping mechanism extends from one of the flat plates toward the other and moveably held in relation to the other plate to clamp in place any member held within the volume between the two plates.

Abstract: A module useful for forming a foundation for a dental prosthesis, the module including at least one each of (a) a post and (b) an extension unit, the post having a threaded end adapted to anchor the post into rigid dental materials such as tooth stubs or bone matrix, and a second retaining end for engaging the extension unit. The extension unit comprises an engaging end to engage the retaining end of the post, and one or two leaves extending from the engaging end transversely from the post. The engaging end is so sized and shaped as to maintain a sloppy fit with the retaining end of the post. The sloppy fit permits a minor, constrained degree of rotation of the extension unit with respect to the post. At least two such modules can be used to form the foundation for a rigid prosthetic dental bridge; at least one of the extending leaves on each module is so formed as to be capable of coupling with one of the extending leaves on a second such module.

Abstract: This invention provides a variable pitch marine propeller which is replaceable onto the drive shaft of a marine engine and which provides an exhaust channel through the propeller. To improve and increase the flow of exhaust gas through the propeller the propeller is provided with a blade shank having a cross-sectional area perpendicular to the direction of exhaust gas flow which is less than the cross-sectional area parallel to such flow in the region of the shank arm attachment. There are also provided, within the interior of the propeller, internal surfaces formed within the blade arm adjacent the shank and defining at least one channel to allow exhaust gases to flow through the arm and counterweight assembly. In addition, the propeller is formed such that the connecting region between the blade arm and the counterweight on each blade has a reduced radial width, smaller than that of the counterweight mass along an axis parallel to the drive shaft axis and parallel to the flow of exhaust gases.

Abstract: A convertible container having two panels hingedly connected to one another along single edges. Recessed interior walls permit the storage of items therein when the panels are closed. A raised ridge along three outer sides of the panels allows an item to be supported and framed within the exterior panels when the container is open and converted to a double length framed area. Various locks keep the panels closed, interior baffles keep items in place when the container is closed and hook devices permit the container to be displayed.

Abstract: A dental implement designed to be retained for reciprocating-movement by the sleeve member of a dental handpiece. The dental implement is comprised of a flat dental tool having a flat blade portion and a flat shank portion. The flat blade portion can also be formed with a triangular or arcuate cross-section while retaining the flat shank portion and the blade edges can be straight or have a saw-tooth configuration. A removable tool holder has a slot to receive the dental tool and a outside cylindrical shape complementary with the bore of the sleeve member. Forces applied to the tool holder control the displacement of locking protrusions on the tool shank to selectively permit the tool to be driven in a reciprocating movement with or without rotation and to be removed entirely from the sleeve member.

Abstract: A compact, modular gray water recycling system includes a control and reservoir unit for storing gray water, which is received from a source such as a sink drain, and is pumped to the household toilet as necessary. The single unit houses a pump, flow signals, filters, and an overflow, as well as a liquid level actuating device for signaling when the liquid level has fallen to below a designated level. The system also utilizes a second storage reservoir and a second control unit for adding gray water from the second reservoir to the control and reservoir unit in response to a signal indicating low water level therein. The secondary storage units may also be adapted to receive water from an outside source such a rainfall runoff.

Abstract: The invention provides a tubular dental mold form with at least one scalloped end and a method, utilizing the form, for forming a universal crown in situ on a tooth stump. In a preferred form, scalloped edges, of different depths, are formed at both ends and are circumferentially offset on one end with respect to the other end.

Abstract: A self-actuating variable pitch marine propeller which incorporates two or more blades which are rotatably connected to a central hub; the blades rotate relative to the hub center about the shank axis. In operation, the blades are biassed towards the lower pitch, both by mechanical means, such as a spring, and optionally also by hydrodynamic load means. As the propeller rotational speed increases, centrifugal forces act to move the blades towards the higher pitch position. In one alternative mode the hydrodynamic load also acts towards the higher pitch position. There is further provided a holding mechanism to retain or hold the blades at least preferably in the lower pitch position, the holding mechanism being so designed that at a sharply defined combination of parameters, including rotational speed and optimally hydrodynamic load acting on the blades, the holding mechanism is caused to be released and the blades permitted to move to a second higher pitch position.

Abstract: A load management system for hydrogen-oxygen fuel cells is provided, for powering vehicles. The load management system operates such that under normal load conditions air is provided as the oxidizing agent for the hydrogen fuel. At high output conditions the air supply is enriched with additional oxygen. The system comprises means responsive to the amperage output from the fuel cell stack to activate valve means for the addition of pure oxygen into the air inlet line. There is also provided means for electrolyzing water to produce pure hydrogen and pure oxygen gas, which may be recyclable to the fuel cell.

Abstract: There is provided a procedure to maintain an otherwise whole tooth, from which the nerve has been removed by carrying out a procedure which includes inserting a thin flexible post, preferably formed of a light-transmitting, physiologically inert material, to the full depth of a prepared relatively narrow tooth nerve canal, which has previously been sealed at its bottom with gutta percha. The post is permitted to abut against the gutta percha. The post is then surrounded by a film of a composite-filler or sealant, which is preferably light-curable, coating the post while supporting and sealing the walls of the canal. The post is sufficiently flexible as to be able to follow the curvature of the canal, which may retain a slight natural curvature. The composite filler or sealant is then cured, preferably by an optical radiation carried through the preferably transparent post. In one embodiment the light-curing post is removable after the sealant has been at least partially cured.

Abstract: The present invention teaches a closed loop energy system including means capable of managing both cooling cycle and the fuel/oxidant gas flow in conjunction with a fuel cell. The system includes a plurality of galvanic cells, gas flow conduit means, internal fluid flow conduit means, heat exchanger means, liquid-gas separator means, and gas repressurization means.

Abstract: A compact, modular gray water recycling system includes a control and reservoir unit for storing gray water, which is received from a source such as a sink drain, and pumping it to the household toilet as necessary. The single unit houses a pump, flow signals, filters, and an overflow. The system may also utilize a second storage reservoir and separate control unit for added gray water storage. The secondary storage and control units may also be adapted to receive water from an outside source such as rainfall runoff.

Abstract: There is provided a self-actuating variable pitch marine propeller which incorporates two or more blades, each independently rotatable, relative to the propeller hub, between a first lower and a second higher pitch. The blades are preferably mechanically linked by coordinating means and are caused to move preferably by a combination of centrifugal force effect resulting from inertial mass means and the hydrodynamic forces acting upon the blade hydrodynamic surface. The rotation of the blades relative to the propeller hub is limited primarily as to speed of rotation by restricted viscous fluid flow damping means operably connected to the blades. In one preferred embodiment, the viscous flow means further acts as an initial restraint against all motion by closing off the viscous flow orifice until a certain minimum propeller rotational speed is achieved.

Abstract: A head unit for remote light sensing utilizes a lens secured in one end opening proximate to the light to be sensed, as well as a passive light source having a radiating end and a passive light collector having a receiving end, the source and collector being secured in a second opening such that both are substantially adjacent to the focal point of the lens and to each other such that the lens substantially collimates light emitted from the passive light source, and focuses received external collimated light at the focal point of the lens. The passive light source and passive light collector are respectively connectible to a powered light source and a photoelectric detector.