Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 4336066 | Method for manufacturing components for magnetic heads of increased abrasion resistance In manufacturing of lamina used for components for magnetic heads such as head cores and shield casings, powder metallurgy is applied to powder material of a permalloy alloy composition in combination with later-staged rolling. Addition of at least one ea... | 06/22/1982 |
| 4335410 | Thin film magnetic transducer A method for formation of thin film inductive magnetic transducers wherein a minimum number of basic photomasks are utilized for deposition of successive thin film winding layers, and wherein all odd-to-even inter-film electrical contact points are dispos... | 06/15/1982 |
| 4321641 | Thin film magnetic recording heads A magnetic read/write transducer head of the type utilizing thin film materials. The method of manufacture comprises steps which deposit a thin film magnetic recording head on a selected substrate having dimensions which enable batch manufacture of a thin... | 03/23/1982 |
| 4317149 | Magnetic head having static discharge means A magnetic head assembly has conductive strips that serve as bypass paths to discharge static electrical charges at a distance from the effective magnetic pole pieces and transducing gap.... | 02/23/1982 |
| 4277808 | Magnetic transducer head A magnetic transducer head having first and second magneto-resistance effect elements, each of which is made of a thin film having the magneto-resistance effect and which are arranged on approximately one line, a current source for flowing currents throug... | 07/07/1981 |
| 4260450 | Method of fabrication for thin film magnetic transducers A method for formation of thin film inductive magnetic transducers wherein a minimum number of basic photomasks are utilized for deposition of successive thin film winding layers, and wherein all odd-to-even inter-film electrical contact points are dispos... | 04/07/1981 |
| 4246695 | Two rail slider assembly production technique for making thin film heads A process is disclosed wherein read/write transducers are applied simultaneously to a mass of motion-constrained, pre-machined, air bearing sliders.... | 01/27/1981 |
| 4242710 | Thin film head having negative magnetostriction A thin film inductive head is formed with nickel-iron binary alloy or nickel-iron-X ternary alloy pole pieces characterized by negative magnetostriction having a saturation magnetostriction coefficient in the range of -1×10-6 to -5×10-6.... | 12/30/1980 |
| 4242711 | Multilayer magnetic head core In a metal-insulator alternate type multilayer head core usable for magnetic sound recording and reproducing, metallic component layers are connected to each other via one or more metallic interconnecting layers passing locally through insulating componen... | 12/30/1980 |
| 4227225 | Magnetic head assembly A magnetic head formed by coupling a plurality of U-shaped cores via a spacer plate close to both surfaces of a shield layer forming magnetic plates each with a width of the cores equal to a desired width of magnetic track, forming a spacer auxiliary slot... | 10/07/1980 |
| 4219855 | Thin film magnetic head A thin film magnetic transducer comprises a non-magnetic substrate and a pair of magnetic pole pieces having different widths. The width of the first pole piece deposited on the substrate is greater than that of the second pole piece to prevent a problem ... | 08/26/1980 |
| 4201837 | Bonded amorphous metal electromagnetic components Magnetic cores suitable for use in transformers, generators and motors are provided. The core is formed of a laminate of layers of substantially amorphous metal laminae compressed to a rigid composite.... | 05/06/1980 |
| 4195323 | Thin film magnetic recording heads A method of manufacture for forming a novel magnetic read/write transducer head of the type utilizing thin film materials. The method of manufacture comprises steps which deposit a thin film magnetic recording head on a selected substrate having dimension... | 03/25/1980 |
| 4191983 | Thin film magnetic head assembly having a thin film magnetic transducer encapsulated in insulating bonding material A thin film magnetic head assembly having a substrate, a thin film magnetic transducer mounted on the substrate and having a transducer portion which is planar with one treated edge of the substrate, a superstrate positioned in spaced parallel alignment f... | 03/04/1980 |
| 4188247 | Manufacture of magnetic transducing heads A process for the manufacture of pole structures for magnetic transducing heads is described in which the configuration of the non-magnetic gaps is formed by abrading the ferrite pole structure through a mask to erode recesses in the gap area which have i... | 02/12/1980 |
| 4156882 | Magnetic transducer A magnetic transducer head has a plurality of magnetic laminations secured together in stacked relation to each other to form a magnetic core having a pair of pole faces disposed in spaced, facing relation to each other with a small gap therebetween and t... | 05/29/1979 |
| 4149205 | Magnetic head and process for making laminated magnetic head An improved integrated magnetic head structure of the type having a plurality of thin metal layers forming a magnetic head winding. These layers are generally symmetrical to a plane of symmetry lying perpendicularly to a gap plane on a non magnetic, insul... | 04/10/1979 |
| 4097910 | Single gap magnetic read head Magnetic ink characters on a document 1A are sensed by a single gap magnetic reading head which employs a segmented linear array having adjoining magnetic sensing elements. Each sensing element is a C-shaped laminated core with the reading head comprising... | 06/27/1978 |
| 4092688 | Multi-track thin film magnetic head A bias conductor layer for a bias current path extends through the gaps of a plurality of unit thin-film magnetic heads, which are placed side by side over signal conductor layers. A spacer layer is provided between upper and lower magnetic material layer... | 05/30/1978 |
| 4086639 | Magnetic head which minimizes the effect of minute variations in the head gap The magnetic head of the present invention has a core thickness set up in accordance with the range of the permeability drop starting frequency of the core material which is determined to reduce the influence imparted to the reproducing frequency characte... | 04/25/1978 |
| 4079430 | Magnetic head Amorphous metal alloys are employed in a magnetic head as core materials in the present invention. Such alloys are generally composed of M and Y, wherein M is at least one of Fe, Ni and Co and Y is at least one of P, B, C and Si. The amorphous metal alloy... | 03/14/1978 |
| 4052749 | Thin film magnetic head A thin film magnetic head includes a magnetic core formed by first and second magnetic layers with at least one winding of conductor layer provided therebetween. Separating layers are provided to electrically isolate the conductor layer from its neighbori... | 10/04/1977 |
| 4049522 | Low coercivity iron-silicon material, shields, and process Iron-silicon is sputtered onto a substrate to be used for a magnetic recording head from a target containing 4% to 7% of silicon with a substrate bias between -2.5 and -60 volts, anode-cathode spacing of about 1/2 to about 2 inches, a deposition rate of g... | 09/20/1977 |
| 4040635 | Releasable stylus arm magnetic coupling A pickup cartridge for a video disc player encloses a stylus arm unit comprising a stylus arm carrying a stylus at one end and a magnetizable connector plate secured at its other end. A permanent magnet is centrally located in a recess provided in a magne... | 08/09/1977 |
| 4025379 | Method of making laminated magnetic material An extrusion billet is fabricated from layers of soft magnetic material separated by one or more metal layers. The billet is coreduced and heat treated to impart the desired magnetic properties to the soft magnetic material and also to form intermetallic ... | 05/24/1977 |
| 4011692 | Method of and device for grinding grooves A method of grinding fine grooves in workpieces of a ceramic material with wires disposed in grooves on the outer circumference of a rotatable drum. A part of the cross-section of each wire extends above the circumferential face of the drum. This grinding... | 03/15/1977 |
| 3975773 | Thin film magnetic heads In a thin film magnetic writing head structure, a high permeability layer is arranged parallel to the lateral face of a pole piece which is situated in the downstream direction of movement of the magnetic record carrier under the head airgap. Said high pe... | 08/17/1976 |
| 3961299 | Magnetic circuit having low reluctance A magnetic circuit which exhibits low reluctance on the path of a magnetic flux and comprises at least one anisotropic thin film formed of an iron-nickel-chromium alloy through which said magnetic flux passes in the hard direction of magnetization of the ... | 06/01/1976 |
