Abstract: Novel permanent magnets of Sm.sub.2 Co.sub.17 type crystal structure are provided herein. The magnets preferably have samarium, cobalt, iron, copper and zirconium in specified amounts. They have superior magnetic properties, including maximum energy product, intrinsic coercivity and second quadrant loop squareness. The compositions of the magnets can be expressed by a general formula ?Co.sub.a Fe.sub.b Cu.sub.c Zr.sub.d !.sub.e Sm. Preferred embodiments, wherein a is about 0.6 to about 0.7, b is about 0.2 to about 0.3, c is about 0.06 to about 0.07, d is about 0.02 to about 0.03, and e is about 7.2 to about 7.4, have unexpectedly high maximum energy product, high intrinsic coercive force and squareness. Processes for producing the improved alloy are also provided.

Abstract: Ways to improve one's grip on an implement through the use of thin, flexible magnetic strips are provided. The flexible magnetic strips can be used with the glove used by the person gripping the implement or with the implement's gripping surface, or with both. Alternatively, the flexible magnetic strips can be used with either the glove or the implement, with the opposing glove or implement surface coated or imbedded with a magnet attracting material. The user's grip is improved due to the magnetic interaction between the glove and the implement.

Abstract: Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a iron-based alloy having a manganese content of from about 8 to about 18 weight percent. The thin strips can be prepared by annealing the alloy, then cold rolling the alloy to reduce its thickness by at least about 40% to produce an initial strip, thermally treating the initial strip between about 400.degree. C. and its austenitizing temperature, cold rolling the initial strip to reduce its thickness by at least 75% to below about 0.005 inches, and thermally treating this strip at a temperature of at least 525.degree. C. for a period of time between about 0.1 and about 3 minutes. The strips are particularly useful in electronic article surveillance systems.

Abstract: Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips can be prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip. The strips can also be prepared by controlling the chemistry of the initial alloy and controlling the processing of that alloy until the desired thickness and requisite magnetic properties are obtained. The strips are particularly useful in EAS systems.

Abstract: Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.003 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips are prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip.

Abstract: Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent. The strips can be prepared by first manufacturing an alloy having a carbon content below about 0.5 weight percent to the desired thickness and then subjecting the strip to a carburizing step to raise the carbon content in the strip. The strips can also be prepared by controlling the chemistry of the initial alloy and controlling the processing of that alloy until the desired thickness and requisite magnetic properties are obtained. The strips are particularly useful in EAS systems.

Abstract: A machine for applying particularly configured pieces of thermally-activated tape to a heated substrate, such as a continuous strip of lead frames, it is capable of long term, high speed operation without becoming fouled with tape pieces or residual adhesive. A drop-through die assembly to blank the tape pieces is mounted for reciprocal movement to and from the metal strip normally supported in spaced relation beneath the assembly. Cooling fluid is circulated through the die and stripper plate of the die assembly for dissipating heat generated in the punch during the blanking operation. This cooling feature together with the normally spaced arrangement of the die assembly and the heated substrate, serves to maintain the temperature of the punch well below the activating temperature of the tape, whereby the tendency of the punch to collect a build-up of adhesive and tape pieces is virtually eliminated.

Abstract: A method and machine are disclosed for screen printing acid-resist mirror inversion images in registration on opposite sides of a metal web with a degree of precision sufficient to permit the incorporation of screen printing techniques in the fabrication of lead frames, electromagnetic core laminations, and other metal plate products by chemical milling processes. A matched pair of upright screen stencils supported in spaced relation on opposite sides of the web is provided with a cooperable pair of squeegees for printing through the image areas of the stencils. The directly opposed squeegees are mounted on a common reciprocable carriage for conjoint movement such that printing on opposite sides of the web is effected synchronously. In preferred forms, a web drive is provided for incrementally advancing the web between the stencils and for holding the web under tension during printing.

Abstract: The method of making a metal lead frame wherein a metal lead frame blank is stamped or etched from a metal strip so as to provide a die attach pad and a plurality of leads attached to the pad. Prior to separating the leads from the pad a retainer is applied to the leads adjacent the pad so that the leads are held in fixed positions during and after their separation from the pad.

Abstract: Magnetic particles and compacts formed therefrom for use as magnetic cores formed of a blend of iron particles and particles of sendust, with the particles containing a coating of an electrical insulator thereon. The particles are compacted and annealed in the practice of this invention to form magnetic cores.

Abstract: Aluminum or other coating material is deposited on the surface of one side of a strip after which ink is deposited on preselected areas of the coated strip. The ink is then cured and the aluminum removed from the uncovered areas after which the ink is removed from the covered area of the aluminum.

Abstract: An iron-chromium-cobalt magnetic alloy characterized by good magnetic quality, improved hot and cold ductility and by a reduction in the minimum temperature for complete solutioning; and processing for producing said alloy. Hot ductility is improved through controlled additions of rare earth elements in conjunction with modified refining. Cold ductility is improved through a rapid cool subsequent to hot working and prior to cold working. Solutioning temperatures are lowered through controlled additions of vanadium and titanium.

Abstract: This invention is concerned with a portable demagnetizer which includes a demagnetizing head supported within a hand held housing. Also contained within the housing is a variable control for applying voltages of decreasing step-less magnitude to the demagnetizing head; and means are also provided to apply a step-less alternating current power to the demagnetization head while voltages of decreasing magnitude are applied to the demagnetizing head. The housing is provided with a control means on the outside thereof so that the demagnetizer may be hand held and varied at the same time by a single individual user, particularly because of a minimum of parts and the use of step-less decreasing voltage magnitudes and the use of step-less alternating current power, which is applied to the demagnetizing head. Similar results can be achieved by slowly moving the work away from the alternating field.

Abstract: Aluminum or other coating material is deposited on the surface of one side of a strip after which ink is deposited on preselected areas of the coated strip. The ink is then cured and the aluminum removed from the uncovered areas after which the ink is removed from the covered area of the aluminum.

Abstract: The invention relates to a novel alloy consisting essentially of 13-18% nickel, 7-11% aluminum, 0.5 to 10% cobalt, 0.1 to 2% silicon and the remainder substantially all iron, as is produced by heating the alloy composition to a temperature of about 1650.degree. C. or above to form a melt and then casting the melt in a suitable mold. After solidification, the casting is heated to approximately 1150.degree. C., held at that temperature for a sufficient time to insure that the whole mass is heated uniformly, and then cooled at the rate of about 300.degree. C. per minute. Parts are then given an aging for the purpose of producing uniform magnetic properties throughout the casting. Magnets thus cast, heat-treated and aged as aforesaid produce very stable magnetic properties with typical values of Br = 10,000, Hc = 150 and BH max = .85.A further improvement in properties can be achieved by a second stage heat treatment wherein castings are heated to about 900.degree. C.

Abstract: The invention relates to a novel alloy consisting essentially of 13-18% nickel, 7-11% aluminum, 0.5 to 10% cobalt, 0.1 to 2% silicon and the remainder substantially all iron, as is produced by heating the alloy composition to a temperature of about 1650.degree. C or above to form a melt and then casting the melt in a suitable mold. After solidification, the casting is heated to approximately 1150.degree. C, held at that temperature for a sufficient time to insure that the whole mass is heated uniformly, and then cooled at the rate of about 300.degree. C per minute. Parts are then given an aging for the purpose of producing uniform magnetic properties throughout the casting. Magnets thus cast, heat-treated and aged as aforesaid produce very stable magnetic properties with typical values of Br = 10,000, Hc = 150 and BH max = .85.A further improvement in properties can be achieved by a second stage heat treatment wherein castings are heated to about 900.degree.

Abstract: A method for making a C-shaped magnetizable core powdered material manufactured by filling a predetermined quantity of the powdered material into a C-shaped mold having two open ends one end being smaller than the other open end and having a trapezoidal cross section, compressing said powdered material to a density of at least 6.0 g/cm.sup.3 by a cooperating, C-shaped ram and a combined C-shaped closure-ejector element; the C-shaped ram entering the larger opening and moving toward the smaller opening which is closed by said closure-ejector element, withdrawing the ram and ejecting the core from the die with said closure-ejector element moving from the smaller opening toward the larger opening whereby the trapezoidal sides of the core are released simultaneously whereby the core uniformly expands in all directions as it is ejected from the die to produce a core having a uniform density and of improved structural, magnetic and electrical properties.