Abstract: The present invention is a method of marking a metal device with an identification symbol or a serial number which is not detectable by a visual examination. The method of marking includes the steps of locally heating a specified area of the metal so that its microstructure is altered. For example, a laser, the intensity of which has been adjusted so as to maintain a designated area at a temperature within an appropriate temperature range for the particular metal, may be used to trace out either an identification symbol or serial number. The method is used in combination with the step of etching away the surface area of the metal device which includes both unaltered microstructure and altered microstructure with a selected chemical etching solution that will etch away the altered microstructure at a different rate than the unaltered microstructure thereby exposing the mark.

Abstract: A paper gauge for use with a shorthand machine to determine the quantity of paper remaining in the shorthand machine. A scale arm weighs the paper tape in the machine and the gauge is calibrated by weight to give the shorthand machine operator a reading in terms of the number of folds left in the paper strip. The displacement of the scale arm is proportional to the weight of the paper tape and movement of the paper gauge indicating means is proportional to displacement of the scale arm. Accurate readings are facilitated by the use of a hinged tray plate to hold the paper tape in correct position on the scale arm. An "L"-shaped end portion of the tray plate in hinged engagement with the base portion of the tray plate successfully prevents the used portion of the paper tape from urging against the remaining supply and thereby causing an inaccurate reading.

Abstract: A system is provided for time segment scrambling speech encoding, wherein an internal key code is provided for control thereof. The scrambling and reset units are synchronized by start and reset clock pulses. The scrambling unit can also scramble individual segments by an inversion process in accordance with a second internal key code, such as, for example, time inversion and frequency inversion. A related system for unscrambling scrambled speech transmission and synchronization therefore is set forth as another embodiment of the invention.

Abstract: An improved slit die for extruding thermoplastic sheet and having the capacity for fine gauge control comprises a die blade and an opposed surface in which the local separation between the two is variable by the generation of localized expansion and contraction forces in the body of the die blade while isolating the die blade lip from temperature variations by the provision of a heat barrier means.

Abstract: The system of the present invention basically consists of a detector unit unted in each bomb or airborne weapon and operable upon interception of a signal emitted by an aircraft-mounted source. The required signal for arming is present only in a well defined zone below the aircraft and only in response to pilot command during weapon release. The signal consists of mechanically modulated beam of high-energy photons (gamma rays) emitted by a radioisotope source on the aircraft. The weapon must fall well below the aircraft to see the signal. Geiger-Mueller tubes are used for radiation detectors and the resulting signal is processed to initiate the arming or fuzing sequence. Power for the operation of the detector and associated electronics is transferred through the metallic covering of the weapon by means of a split-core transformer at the time of release.

Abstract: The system of the present invention basically consists of a detector unit unted in each bomb or airborne weapon and operable upon interception of a signal emitted by an aircraft-mounted source. The required signal for arming is present only in a well defined zone below the aircraft and only in response to pilot command during weapon release. The signal consists of an unmodulated beam of high-energy photons (gamma rays) emitted by a radioisotope source on the aircraft. The weapon must fall well below the aircraft to see the signal. Geiger-Mueller tubes are used for radiation detectors and the resulting signal is processed to initiate the arming or fusing sequence. Power for the operation of the detector and associated electronics is transferred through the metallic covering of the weapon by means of a split-core transformer at the time of release.

Abstract: An improved trailer particularly adapted for use in transporting motorcycles and having a retractable suspension arrangement whereby the load carrying bed may be raised for towing and lowered to ground level to facilitate loading and unloading. The suspension may be locked in the retracted position thereby rendering the trailer immobile and secure from theft and the suspension mounting may be vertically adjusted to vary ground clearance of the load bed without restricting operation of the retracting mechanism.

Abstract: The ends of refractory-lined rotary kilns are often subjected to such intense heat flux that the steel shell of the kiln at either or both ends is subjected to substantial thermal expansion in both the longitudinal and circumferential directions, resulting in premature cracking and failure of the refractory. The present apparatus is a rotary kiln wherein either or both ends of the steel shell thereof are provided with a plurality of substantially longitudinal slots which accommodate circumferential expansion and the refractory is affixed to the steel shell at such end(s) with sliding anchors to accommodate longitudinal expansion.

Abstract: The present disclosure is directed to a process of separating oil from oil-containing wastewater which comprises treating the wastewater with a water-soluble cationic polymer obtained by the polymerization of an epihalohydrin with an alkylene polyamine having the formula ##STR1## wherein R is a lower alkylene having from 2 to about 6 carbon atoms, and R.sub.1 and R.sub.2 are each a lower alkyl of from 1 to about 6 carbon atoms.

Abstract: A lightweight, unitary plastic pallet adapted for handling heavy powder loads. The pallet has a substantially rigid lower deck, a flexible, reinforced and continuous upper deck adapted to deflect against the lower deck under load, and a plurality of integral legs permitting forklift transport of the pallet.

Abstract: The present disclosure is directed to novel water-soluble cationic polymers and their use either alone or in conjunction with coagulant aids to flocculate or coagulate matter suspended in aqueous systems. The novel polymer is prepared by reacting an alkylene polyamine with an epihalohydrin under specific conditions which include the incremental reaction of the epihalohydrin to fully react with the epihalohydrin and attain a polymer of uniform viscosity.

Abstract: A hollow molded unitary plastic pallet is provided for use in handling and transporting cargo, particularly with forklift trucks. The pallet comprises upper and lower surfaces with legs disposed on the lower surface. Reinforcement of the pallet is achieved by means of holes through the pallet surfaces and by means of reinforcing grooves disposed on the legs and on the lower surface of the pallet. The grooves on the lower surface extend from the holes to the legs and continue down along the length of the legs to their bases.

Abstract: The present disclosure is directed to a process of separating oil from oil-containing wastewater which comprises treating the wastewater with a water-soluble cationic polymer obtained by the polymerization of an epihalohydrin with an alkylene polyamine having the formula ##STR1## wherein R is a lower alkylene having from 2 to about 6 carbon atoms, and R.sub.1 and R.sub.2 are each a lower alkyl of from 1 to about 6 carbon atoms.