Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 5198090 | Sputtering apparatus for producing thin films of material A sputtering apparatus for coating a substrate comprising a first electrode for supporting a target material and a second electrode for supporting a substrate, upon which the coating is deposited. A source of RF power is connected to impose an RF voltage ... | 03/30/1993 |
| 5164869 | Magnetic recording head with integrated magnetoresistive element and open yoke An integrated inductive write, magnetoresistive (MR) read thin film magnetic head comprising an open magnetic yoke having outside legs each having a winding thereon and a central leg having an opening across which the MR element is coupled. The outer legs... | 11/17/1992 |
| 5159508 | Magnetic head slider having a protective coating thereon A magnetic head slider having a protective coating on the rails thereof, the protective coating comprising a thin adhesion layer and a thin layer of amorphous hydrogenated carbon. The protective coating is deposited on the air bearing surface of the slide... | 10/27/1992 |
| 5117320 | Magnetostrictive head with d.c. bias magnetic field A magnetic head device comprising a magnetic core member made from a magnetic material having a positive magnetostriction constant and having confronting pole pieces separated by a non-magnetic material to form a transducing gap. A coil is wound around th... | 05/26/1992 |
| 5114913 | Magnetic head slider employing superconductor for levitation A slider assembly for supporting a magnetic head a small uniform spacing above the surface of a magnetic recording medium comprising a slider body having a layer of superconducting material on the surface of the slider assembly which faces the surface of ... | 05/19/1992 |
| 5079035 | Method of making a magnetoresistive read transducer having hard magnetic bias A magnetoresistive (MR) read transducer having passive end regions separated by a central active region in which an MR layer is formed which extends over substantially only the central active region and in which a hard magnetic layer is formed in each end... | 01/07/1992 |
| 5059989 | Thermal edge jet drop-on-demand ink jet print head A thermal drop-on-demand ink jet print head in which conductor electrodes are formed on opposed surfaces of a print head substrate and extend to the edge of the substrate. An array of heater elements is formed on the edge of the substrate in electrical co... | 10/22/1991 |
| 5032935 | Amplification of signals produced by a magnetoresistive element A circuit for producing a signal whose magnitude is a chosen amplitude compensation characteristic of the signals produced by a magnetoresistive (MR) element comprising an input stage which produces an amplified output signal which is coupled to the outpu... | 07/16/1991 |
| 5026470 | Sputtering apparatus A sputtering apparatus in which the electrode for supporting the substrates upon which thin magnetic films are to be deposited has a polygon-shaped planar coil adjacent to a surface so that the coil can be energized to produce a uniform magnetic field at ... | 06/25/1991 |
| 5018037 | Magnetoresistive read transducer having hard magnetic bias A magnetoresistive (MR) read transducer having passive end regions separated by a central active region in which an MR layer is formed which extends over substantially only the central active region and in which a hard magnetic layer is formed in each end... | 05/21/1991 |
| 5014147 | Magnetoresistive sensor with improved antiferromagnetic film An improved thin film magnetoresistive (MR) sensor uses an alloy comprising Fe.sub.(1-x) Mnx, where x is within the range of 0.3 to 0.4, as an antiferromagnetic layer to provide longitudinal exchange bias in the ferromagnetic MR layer. In a spe... | 05/07/1991 |
| 5005096 | Magnetoresistive read transducer having hard magnetic shunt bias A magnetoresistive (MR) read transducer comprising an MR layer having passive end regions separated by a central active region. A longitudinal bias is produced by a thin film of hard magnetic material in the end regions only, and the thin film of hard mag... | 04/02/1991 |
| 4961121 | Air bearing slider rail design with trumpet-shaped rail portion An air bearing slider for supporting a transducer is provided with a pair of rails having an air bearing surface with a continuously curved part with its greatest width at the leading end of the slider. In the rear area of the slider the air bearing surfa... | 10/02/1990 |
| 4943816 | High quality thermal jet printer configuration suitable for producing color images A printer suitable for color printing which uses an ink jet printhead in which the marking fluid contains no dye so that a latent image of the desired print pattern is produced in the form of moistened spots directly on the print medium. The latent image ... | 07/24/1990 |
| 4940511 | Method for making a magnetoresistive read transducer A magnetoresistive (MR) read transducer comprising a thin film MR layer formed of ferromagnetic material and a nonmagnetic thin film spacer layer in contact with the MR layer. The spacer layer comprises a material selected from the group consisting of nic... | 07/10/1990 |
| 4939837 | Batch fabrication process for magnetic heads A process for the batch fabrication of an array of shielded magnetoresistive (MR) read transducers comprising the steps of depositing a full film over the entire substrate of a first magnetic shield layer, a first non-magnetic gap layer and sputter deposi... | 07/10/1990 |
| 4918554 | Process for making a shielded magnetoresistive sensor The method for making a shielded magnetoresistive (MR) sensor in which the first shield is made of sendust and the second shield is made of permalloy. The method comprises the stages of depositing a layer of sendust to form a first shield; heat treating t... | 04/17/1990 |
| 4914868 | Lapping control system for magnetic transducers A lapping control system for a row of thin film magnetic transducers formed on a substrate. Each of the magnetic transducers comprises a magnetoresistive (MR) element, and the row is supported on a holder which has an elongated H-shaped slot near one edge... | 04/10/1990 |
| 4912883 | Lapping control system for magnetic transducers A lapping control system for a row of thin film magnetic transducers formed on a substrate. Each of the rows comprises a plurality of thin film magnetic transducers and at least two test structures. Each test structure has at least two elements which comp... | 04/03/1990 |
| 4894740 | Magnetic head air bearing slider An air bearing slider for supporting a magnetic transducer comprising a pair of coplanar side rails on the sides of an air bearing surface of the slider and a center rail along the central region of the air bearing surface to form recessed areas between t... | 01/16/1990 |
| 4879619 | Magnetoresistive read transducer A magnetoresistive (MR) read transducer comprising a thin film MR layer formed of ferromagnetic material and a nonmagnetic thin film spacer layer in contact with the MR layer. The spacer layer comprises a material selected from the group consisting of nic... | 11/07/1989 |
| 4879610 | Protective circuit for a magnetoresistive element A protective circuit for a magnetoresistive (MR) element having a first and a second terminal in which a first current source is coupled to the first terminal of the MR element to produce a bias current through the MR element and a second current source i... | 11/07/1989 |
| 4878290 | Method for making thin film magnetic head A method for making a thin film magnetic head in which the pole tips are trimmed to a predetermined width prior to the completion of the magnetic yoke structure. The thin film magnetic head is produced through deposition of the first magnetic layer in two... | 11/07/1989 |
| 4873599 | Magnetic head assembly for perpendicular magnetic recording A magnetic recording head assembly for perpendicular magnetic recording for the type in which both the main magnetic pole and auxiliary magnetic pole are on the same side of the magnetic medium. The auxiliary magnetic pole is made from a material having t... | 10/10/1989 |
| 4872071 | Method and apparatus for detecting abnormal operation of moving storage apparatus A method and apparatus for detecting abnormal operation in a magnetic disk file which comprises reading data for each head and each track to obtain a readback signal. The readback signal is read from a predetermined area of each track on a disk that is no... | 10/03/1989 |
| 4870433 | Thermal drop-on-demand ink jet print head An array of resistive heater elements, each of which is connected in an electrical circuit between a common electrode and one of the control electrodes. Each of the resistive heater elements comprises a plurality of portions arranged so that a small elong... | 09/26/1989 |
| 4847636 | Thermal drop-on-demand ink jet print head A thermal drop-on-demand ink jet print head in which thermal cross-talk problems are eliminated by providing heat shield members in the space between each of the heater elements. The heat shield members comprise metal fingers attached to either the common... | 07/11/1989 |
| 4825325 | Magnetoresistive read transducer assembly A magnetoresistive (MR) sensor which is provided with longitudinal bias by means of exchange coupling between the ferromagnetic MR layer (NiFe) and an ultrathin layer of an antiferromagnetic material (FeMn) with a thickness within the range of about 25 to... | 04/25/1989 |
| 4819091 | High speed magnetic disk contact recording system A high speed magnetic disk recording system is described in which the recording medium comprises a substrate having a magnetic coating thereon, and a magnetic recording transducer is operated in physical contact with the recording medium. The magnetic tra... | 04/04/1989 |
| 4809109 | Magnetoresistive read transducer and method for making the improved transducer An improved magnetoresistive (MR) read transducer in which a layered structure comprising an antiferromagnetic layer in direct contact with an MR layer is subjected to a thermal annealing process by heating the structure to a temperature within a chosen r... | 02/28/1989 |
| 4802968 | RF plasma processing apparatus A sputtering apparatus for coating a substrate comprising a first electrode for supporting a suitable target material and a second electrode for supporting a substrate, upon which a coating is deposited. A source of RF power is connected to impose an RF v... | 02/07/1989 |
| 4795981 | Method for monitoring the performance of the head-disk-interface and device for preventing data losses due to magnetic head-disk-interferences A method and apparatus is described by which, in magnetic disk storage systems where a triboelectric current can be observed to flow between slider and disk surface, a saving signal can be generated by which a saving action can be initiated to save the da... | 01/03/1989 |
| 4792818 | Thermal drop-on-demand ink jet print head A thermal drop-on-demand ink jet print head in which a heat delay means is provided covering a predetermined part of the resistive element. Upon connection of an electrical signal to energize the resistive element, nucleation occurs at an uncovered locati... | 12/20/1988 |
| 4791440 | Thermal drop-on-demand ink jet print head A thermal drop-on-demand ink jet print head in which an array of heating means is provided on one surface of a substrate member. A common electrode provides electrical contact to the heating means, and an array of data electrodes provides electrical conta... | 12/13/1988 |
| 4785366 | Magnetoresistive read transducer having patterned orientation of longitudinal bias A magnetoresistive (MR) read transducer assembly in which the thin film MR layer is longitudinally biased only in the passive regions by exchange bias developed by a thin film of antiferromagnetic material that is deposited in direct contact with and cont... | 11/15/1988 |
| 4782414 | Magnetoresistive read transducer with insulator defined trackwidth A magnetoresistive (MR) read head in which an insulator layer defines the effective track width over which the read head is sensitive. The insulator layer is deposited or patterned to extend a predetermined distance over the MR element, and the predetermi... | 11/01/1988 |
| 4777544 | Method and apparatus for in-situ measurement of head/recording medium clearance A method and apparatus for measuring the flying height of a slider supporting a magnetic transducer in-situ in a direct manner in an operational magnetic disk storage system. The method and apparatus produce relative motion between the magnetic transducer... | 10/11/1988 |
| 4771349 | Magnetoresistive read transducer A magnetoresistive (MR) read transducer assembly in which the thin film MR layer is longitudinally biased directly only in the end regions by exchange bias developed by a thin film of antiferromagnetic material that is deposited in direct contact only in ... | 09/13/1988 |
| 4771298 | Drop-on-demand print head using gasket fan-in An ink jet drop-on-demand print head comprises a plurality of electromechanical transducers, and ink from a manifold is conveyed to the transducers. The fluid path between the transducers and the corresponding nozzle in the nozzle array comprises a resili... | 09/13/1988 |
| 4760478 | Visco-elastically damped magnetic head suspension assembly A magnetic head support arm for a disk file comprises a relatively rigid arm structure and a magnetic head suspension assembly fixed at one end to the head support arm having means on the other end to support a transducing head, and having a tapered elong... | 07/26/1988 |
