Abstract: A refrigerant recovering apparatus for cooling equipment having a compressor, an evaporator, and a condenser having a relief valve thereon, the apparatus comprising a chamber having connecting means to the relief valve at one end and connecting means to the compressor at the other end; means on the chamber for conveying the collected refrigerant therein to the compressor; and means for deactivating the compressor upon a predetermined refrigerant pressure in the chamber.

Abstract: A solar energy concentrating and collecting assembly including a formed synthetic resin radiation concentrator having a series of elongated, generally rectilinear, side-by-side, parallel solar ray focusing surfaces that extend in a direction which is at an angle relative to the side margins of the focusing area but are of helical configuration longitudinally thereof in order to focus the solar radiation onto a narrow zone spaced from the concentrator which is parallel with the side margins of the focusing area. In its preferred form, the focusing surfaces define a Fresnel-type concentrator.

Abstract: A collar particularly adapted for animals and characterized by an improved reflective surface is provided. An elongated, flexible strip of clear extruded plastic has a pocket which extends through a convex arc of at least ninety degrees. A strip of light-reflective material is sealed in the pocket so as to present a convex light-reflective surface. By sealing the reflective material within the transparent pocket, it is not possible for the animal to wear away the light-reflective surface and dirt and other foreign materials cannot diminish its light-reflective ability. In one embodiment the flexible strip is sealed at both ends and a buckle is secured while complemental eyelets are provided for presenting means to secure the collar around the animal. In another embodiment, an elongated slot is provided along the length of the collar and is adapted to receive a conventional collar thereby permitting the reflective collar to be slipped on and off and worn only when needed.