Abstract: A message transmission system for the secure transmission of multi-block data messages from a sending station to a receiving station.The sending station contains cryptographic apparatus operative in successive cycles of operation during each of which an input block of clear data bits is ciphered under control of an input set of cipher key bits to generate an output block of ciphered data bits for transmission to the receiving station. Included in the cryptographic apparatus of the sending station is means providing one of the inputs for each succeeding ciphering cycle of operation as a function of each preceding ciphering cycle of operation. As a result, each succeeding output block of ciphered data bits is effectively chained to all preceding cycles of operation of the cryptographic apparatus of the sending station and is a function of the corresponding input block of clear data bits, all preceding input blocks of clear data bits and the initial input set of cipher key bits.

Abstract: An apparatus for crimping couplings to hose ends having a crimping ring with a tapered camming surface and a plurality of circumferentially-disposed crimping dies having crimping surfaces for crimping the couplings and opposed camming surfaces for cooperation with the crimping ring camming surface, means for moving the crimping ring or dies relative to one another to provide the crimping action with the movable element being moved to the same stop position each time of operation irrespective of the extent of crimp desired, and means for adjusting the relative position between crimping ring and dies at the location where the movable element is at the said stop position so as to provide adjustment for the extent of crimp.

Abstract: The specification discloses a magnetic proximity sensing apparatus especially adapted for use with fluid cylinders having pistons formed from magnetically attractable material. The apparatus includes clamping means for securing it to a tie rod of a fluid cylinder or directly to the cylinder body in juxtaposition to a side of the cylinder without disassembly of the cylinder. Also included are magnetic actuator means responsive to the proximity of the fluid cylinder piston which close a switch and enable electrical circuitry for controlling fluid valves or other apparatus.

Abstract: Disclosed are a method and system for ion-exchanging cations in zeolitic particles of a size useful in fluidized bed processes; for example, zeolitic microspheres of the type employed in fluidized bed hydrocarbon conversion processes. The zeolitic particles are ion-exchanged by a stagewise countercurrent contact with ion-exchange liquid as they are moved in series over a continuously moving horizontal vacuum belt filter in the form of a thin porous cake, then into an agitated tank where the cake is formed into a slurry, and to another continuously moving vacuum belt filter where the microspheres are again formed into a thin porous cake. The latter cake is contacted with incoming ion-exchange liquid that percolates through the cake, passes to the agitated tank and is charged to the cake on the first belt filter.

Abstract: A fluid valve apparatus particularly for pneumatic service (air or other gases) in a filter/separator for opening and closing a valve in response to the level of liquid in a container. The apparatus includes a valve having a magnetically attractable portion and a float having a magnet therein adjacent but physically separated from the valve for opening and closing the valve magnetically in response to changes in the liquid level within the container. In the preferred embodiment, the valve apparatus is used with a filter/separator in an air pressure supply line to automatically dump water and other liquids condensed from the air supply and collected in the filter reservoir.

Abstract: A curable powder resin composition comprising an aminoplast and a polyester or polyacrylic resin. The aminoplast is a condensate of a methylolurea or methylolaminotriazine with an aliphatic alcohol and a reactive compound containing at least one reactive group selected from the group consisting of hydroxyl and amide.

Abstract: A process for preparing a free-flowing curable powder resin composition with a sintering temperature above 40.degree.C., comprising the steps of condensing a methylolurea or methylolaminotriazine with an aliphatic alcohol and a reactive compound containing hydroxyl or amide groups; blending the condensate with a polyester or polyacrylate; and grinding the blend to a powder of average particle size in the range of 20 to 150 microns.