Abstract: A new and improved walkable secure patio door threshold with a lower extrusion having a lower surface and a vertical extension. The lower surface has a plurality of apertures vertically therethrough. The vertical extension is integral with the lower surface of the lower extrusion. An upper extrusion has a plurality of guide grooves and a plurality of break grooves. Each of the guide grooves function to receive a sliding door. Each of the break grooves function to allow adjustment to accommodate a various number of sliding doors. A convoluted end portion is formed adjacent the sliding groove. A plurality of countersunk apertures are formed within the plurality of guide grooves. The countersunk apertures are aligned with the plurality of apertures formed in the lower surface of the lower extrusion for securement thereon.

Abstract: An improved liquid material dispenser of the type which transmits fluid to be diffused from an enclosed reservoir to an exposed evaporative surface by means of a wick. A wick is provided in the form of a sheet which has a very high evaporative area compared to the volume of liquid which is retained outside the confines of the reservoir at a given time. The critical relation of evaporation area to volume of liquid outside the reservoir is such that the exposed liquid material weight per square centimeter of evaporative surface is less than 10 milligrams per square centimeter. The material to be dispensed, preferably a perfume, comprises at least 50% of materials of no more than moderate volatility as defined herein. Materials having low volatility as defined herein are minimized, and the quantity of low volatility ingredients in said liquid materials is related herein to the holding capacity of the evaporative surface of the wick.

Abstract: An air treating device in which the exhaustion of the operative fluid is visually signaled by a run-out signal system. The operative fluid and an immiscible signal fluid are held in a reservoir having associated therewith a substrate that selectively first wicks the operative fluid onto the evaporative surface portion of said substrate and, when the operative fluid is substantially depleted, the substrate then transports the signal fluid to the evaporative surface. The signal fluid is of a different hue from the operative fluid to provide an easily observed signal denoting exhaustion of the operative fluid.