Abstract: A handheld detector gives a warning when a magnetic field exceeds the safety level for a particular medical implant that is magnetically activated. A front surface of the device corresponds approximately to a surface region of a patient's body in a vicinity of an implanted medical device. The magnetic detection element is located at substantially the same distance from the front surface as the control element of the medical device is from the surface region of the patient's body when the device is implanted. The detector element may be activated by a magnetic pressure, that is the vector cross product of the magnetic flux density (B) of a magnet and the applied magnetic field (H), which is less than the magnetic pressure that activates the control element of the implant device. An electronic circuit connected to the detection element may be used to indicate activation of the detection element.

Abstract: A method for encrypting data is described which employs a key that includes a plurality of alphanumeric characters and a memory array adapted to operate on NxM pixel display. The method includes the steps of:a. inserting data in the memory array which, if written to the display would substantially fill it with a diffuse pattern of on and off pixels;b. selecting a first subarray of data from the memory array, the selection being controlled by a predetermined function;c. logically combining the selected first subarray of data with a second, equal size, subarray of data, using an exclusive-OR function, the second subarray determinable from the predetermined function.d. writing the results of the logical combination into a corresponding second subarray area in the memory array;e. repeating, in accordance with a predetermined function, steps b, c, and d until the memory array contains a pseudorandom distribution of bits; andf.

Abstract: An electrochemical process for rapidly achieving the recovery of precious metals such as gold and silver from their ores. The ore is formed into a slurry and combined with an electrolyte such as sodium cyanide and an alkaline substance such as sodium hydroxide to increase alkalinity to at least 0.01 equiv./liter. The ore slurry and electrolyte are placed in a recovery apparatus in direct touching contact with closely spaced large area anodic and cathodic electrodes, preferably spaced apart by a distance of about 1 cm. or less. A voltage is applied to the electrodes to produce a current density in the slurry of about 10 to 20 amperes per square meter, and the slurry is agitated to provide diffusion of the ore grains into electrical contact with the electrodes to promote precious metal dissolution.

Abstract: An electrochemical process of the type for recovering precious metals such as gold and silver from their ores by adding to a slurry of the ore a cyanide complexing agent such as sodium cyanide and by electrolytically recovering the precious metal. The process is characterized by the use of small quantities, e.g., 50 milligrams per liter, of a water soluble electroconductive cationic resin, preferably polyvinylbenzyltri-methylammoniumchloride sold under the name ECR-34 by Dow Chemical Company of Midland, Michigan as an aqueous solution containing 33.7% of solids. The use of such a resin increases the amount of precious metals recovered from the ore per unit of time, improves the degree of recoverability, and improves the quality of the recovered metal.