Abstract: A angular interlocking floor tile is provided with a generally flat top surface, a parallel bottom surface, wherein the tile includes two elongated sides which converge to a point or short inner side at one end and which sides diverge at an internal angle of less than 90.degree. to be joined at their other ends by a beveled outer edge surface. The elongated sides are formed with a plurality of female cavities located adjacent to each of the sides. Each of the female cavities is positioned to mate with a corresponding male connecting member of a neighboring tile of a runner mat whereby the runner mat is able to make variety of turns. Alternatively, each of the elongated sides may be formed with an additional integral interlocking strip having male connecting members which may be used to mate with a corresponding female cavities of a neighboring tile. When the interlocking strip is not needed it may be removed.

Abstract: An interfacing floor tile in the form a right triangle with two adjacent sides of equal length is provided with elongated third side opposite the right triangle. Each side is formed with a row of female cavities located adjacent the sides and positioned to mate with a corresponding male connecting members of a neighboring tiles. Additionally, each of the adjacent sides is integrally formed with an edge which slopes downward to a male interlocking strip which extends outwardly in order to mate with female cavities of neighboring tiles. Alternatively, each of the adjacent sides may be formed with vertical edges which rise from the interlocking strip to the surface of the tile. In another embodiment the female cavities are omitted from the elongated side which has a vertical edge and the adjacent sides may have either sloping or vertical edges.

Abstract: A laser cathode-ray tube having an electron beam source, a means for its control, and a laser target containing a supporting substrate, a cavity resonator formed by two mirrors and multilayer semiconductor structure having active and passive strained layers, whose difference in lattice parameters in a free state is up to 10% or more and which have coherent boundaries between each other in the structure.

Abstract: A quadrilateral floor tile is provided with a generally flat top surface with each side having a downward sloping edge, inclining toward the floor. Two of the sides, being adjacent, are formed with an integral interlocking strips, each having a plurality of spaced-apart male connecting members. The remaining sides of the tile are formed with a plurality of cavities located to the interior to the sloping edge. Each of the cavities is positioned to mate with a corresponding male connecting member of a neighboring tile. In use, the tiles are interlocked with a number of like tiles to form a basic floor surface. When the outer periphery of the floor surface is encountered, a finished tile edge is formed on perimeter tiles by severing the interlock strip from each tile. The length of each interlock strip may also be adjusted to interlock only at points of intersection with neighboring tiles or may be removed entirely to form a smooth edge.

Abstract: A structure constructed to reduce the impact of visual imperfections having at least one visible surface which is covered by a first basecoat of an exterior water-based flat paint. The first basecoat is then covered by a layer of multicolor paint. Upon the incidence of the surface being visually marred, for example by graffiti, a second basecoat, similar in hue to the first basecoat, is applied over the portion of the surface that had been marred. A second layer of multicolor paint, similar in hue to the first layer of multicolor paint, is then applied over the second basecoat. The ability of the first basecoat to adhere to the structure may be enhanced by the addition of concrete glue to the flat paint. In addition the multicolor paint may be made reflective by the addition of glass beads or particles to both first and second layers of multicolor paint prior to its application.

Abstract: The present invention is an apparatus for controlling a water delivery system utilizing an instant flow tankless water heater. It includes a programmable microprocessor with support circuitry to achieve control of the outlet temperature of a varying flow rate and varying inlet temperature stream. The system senses a water outlet temperature and controls AC power through an on/off mechanism to regulate power to heating elements embedded in the water stream. The capabilities of the heating elements are improved through the application of using a microprocessor to perform a proportional (P), integrating (I) and derivative (D) calculation. The calculations are used to determine the operating characteristics of the heating system and to control the heating system.

Abstract: A floor mat is provided with a generally flat upper wall with a multitude of y-shaped ribs extending vertically downward from the upper wall to a floor surface, supporting the mat. Each of the y-shaped ribs has a solid central core with three legs which extend horizontally radially outward from the core. The distal end of each of the legs is bulbously enlarged. The ribs are spaced apart in a symmetrical pattern so that two sides of three adjacent ribs cooperatively define a generally cylindrical pocket. The pocket, while forming an enclosure, nevertheless had lateral openings at three equally spaced locations formed by the ends of each of two adjacent ribs being spaced slightly apart allowing for ingress and egress of air from the pocket. Located above the center of each pocket is a hollow dome formed in the upper wall.

Abstract: A magnetic sweeping device includes an integral non-metallic housing with a longitudinal slot containing spaced apart magnets, the housing having a streamlined shape with rounded ends and having a non-metallic semi-circular cylindrical cuff with a diameter slightly smaller than the diameter of the housing. In use, the housing is directed over, under or in contact with a surface which bears ferro-metallic particles or debris. The debris is attracted to the surface areas of the housing which are immediately adjacent to the magnets. When sufficient debris has been collected on the surface of the housing, the cuff is slid across the housings surface pushing the debris toward one end of the housing. Since either end of the housing has an area where there is a magnetic flux void, the debris will freely fall off the housing to be collected.

Abstract: An ophthalmic drug dispensing system in the form of a hand held device constructed of a soft pliable material with a bleb or bulbous area in its forward portion. Contained within the bleb is a fluid chamber which is connected to an orifice located in one end of the dispensing system.In use, the chamber is filed with a drug or medication and the device is inserted between the sclera of the eye and the upper eyelid with the bleb contacting the inner surface of the eyelid. Due to the pressure of the inner side of the upper eyelid upon the bleb, the drug or medication is forced from the chamber and out through the orifice by way of the channel.

Abstract: In a laser screen for a cathode-ray tube having a semiconductor member of a semiconductor compound positioned between a partly transparent mirror and a reflecting mirror, an intermediate member is grown by deposition from vapor phase on the partly transparent mirror. The intermediate member is made of a semiconductor material transparent for radiation generated by the screen and has a bandgap width which is at least 0.98 times as great as the bandgap width of the material of the semiconductor member. The intermediate member is cemented to a transparent heat removing support member.

Abstract: A semiconductor member of a laser screen cathode-ray tube is made of a semiconductor compound selected from the group consisting of binary, three-component and four-component compounds of elements of the second and sixth Groups of the Periodic System and a support member is made of a semiconductor compound of the same type with a bandgap width such as to make it transparent for radiation generated by said screen. Maximum of 15% of atoms of the overgrown support member are substituted for isovalent atoms and the bandgap width of the support member is at least 0.1 eV greater than the bandgap width of the semiconductor member. The support member is overgrown from vapor phase on a partly transparent mirror deposited to one side of the semiconductor member forming an optical cavity with a reflecting mirror deposited to the opposite side of the semiconductor member.