Abstract: Particulate material is cooled by passing into the material a coolant stream of liquid nitrogen having a gaseous product around at least a portion of the liquid nitrogen, wherein the coolant stream is formed outside the particulate material in a nozzle body from which the coolant stream is passed into the particulate material.

Abstract: Particulate material is cooled by passing into the material a coolant stream of liquid nitrogen having a gaseous product around at least a portion of the liquid nitrogen, wherein the coolant stream is formed outside the particulate material in a nozzle body from which the coolant stream is passed into the particulate material.

Abstract: Particulate material is cooled by passing into the material a coolant stream of liquid nitrogen having a gaseous product around at least a portion of the liquid nitrogen, wherein the coolant stream is formed outside the particulate material in a nozzle body from which the coolant stream is passed into the particulate material.

Abstract: Particulate material is cooled by passing into the material a coolant stream of liquid nitrogen having a gaseous product around at least a portion of the liquid nitrogen, wherein the coolant stream is formed outside the particulate material in a nozzle body from which the coolant stream is passed into the particulate material.

Abstract: A compressible gasket is mounted on retainers in the space between the surfaces of first and second structures such as an apparatus and a door. The gasket can move axially on the retainers and can pivot transversely on the retainers, thereby affording access to the spaces around and behind the gasket for easy cleaning and inspection.

Abstract: A cleaning and scrubbing apparatus is described which consists of a vacuum head to which is coupled small hollow fibers. Each of the fibers has a diameter of approximately the size of the record groove so that it may fit within the record groove to scrub away debris formed within the groove. A cleaning fluid is be placed over the record to partially dissolve the debris so that the fibers can loosen it as the record is rotated across the fibers. The vacuum causes the cleaning fluid including the debris to be sucked through the hollow opening of the fibers. The side walls of the fibers may be a membrane material so that additional fluid flows through the side walls. In order to clean the cleaning head, the fluid is forced in the reverse direction while the head and fibers are facing upright, thereby washing away the debris which has become affixed to the fibers.