Abstract: A mattress cover for covering a portion of a mattress that generally has a top surface and a plurality of side panels. The mattress cover generally comprises a waterproof cover, a fabric cover and at least one fastener to secure the fabric cover to the waterproof cover. The waterproof cover has at least one waterproof layer or portion for covering at least a portion of the top surface of the mattress. The at least one waterproof layer or portion has a plurality of edges. The fabric cover is removably securable to the waterproof cover.

Abstract: A method and apparatus for treating a liquid mixture to separate a clarified fraction therefrom leaving a concentrated sludge fraction involve injecting a flocculent material into the liquid mixture; and inletting the liquid material and the flocculent maerial tangentially into a vertical tank having a perforated plate spaced from its upper end dividing the tank into an upper chamber and a lower chamber, a to produce a flow in the lower chamber having a rotational velocity in the horizontal direction adjacent the outer periphery of the lower chamber, and a lower rotational velocity in the horizontal direction adjacent the center of the lower chamber. The holes in the perforated plate define reduced-area passages from the lower chamber to the upper chamber producing a vertical flow of low velocity in the lower chamber and of higher velocity through the passage in the perforated plate.

Abstract: A self-threading stitching device for joining uncured composite laminates which comprises a vertically mounted needle shaft adapted for reciprocal motion, a thread feeding means operating synchronously with the needle shaft and self-threading needle means adapted to pick up the thread from the thread feeding means and carry the thread through uncured composite laminate being penetrated by the needle and release the thread in the laminate as the needle withdraws therefrom.