Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 7368077 | Induction quenching installation, in particular for fabricating suspension components A thermal quenching installation making use of induction heating. This installation has induction heater means comprising a stationary induction coil, handling means to cause the element to pass through said coil, and cooling means, preferably a shower, disposed dow... | 05/06/2008 |
| 7253381 | Multi-frequency heat treatment of a workpiece by induction heating An apparatus and process are provided for multi-frequency induction heat treatment of workpieces including gears. High frequency power is applied to an induction coil that surrounds the workpiece so that a high frequency magnetic field couples with the workpiece to ... | 08/07/2007 |
| 7146735 | Method of making a bearing ring for a large roller bearing A bearing ring for a large roller bearing is formed with at least one annular race which is hardened by heating by juxtaposing that race with an inductor across a spacing which is maintained during the heating and then quenching. The spacing is controlled selectivel... | 12/12/2006 |
| 7056255 | Differential cage for a differential gear In a differential cage for a differential gear, a cage member is provided with a cavity machined on an inside and having an installation opening for compensating gears and driving gears. An axle drive gear and a parking lock gear form a one-piece forging together wi... | 06/06/2006 |
| 6822206 | Device for the inductive heating of a toolholder The induction coil of a device that heats a toolholder (1) inductively for the tool change comprises a shielding collar (27) of magnetizable material which, firstly, concentrates the magnetic flux of the induction coil (13) in a sleeve section (... | 11/23/2004 |
| 6734406 | Method for improving the mechanical properties of journal crosses by induction heating The invention relates to a method for improving the mechanical properties, especially the hardness, of journal crosses for use in articulated shafts. According to the invention, a superficial area which is defined by the transition surfaces between two journals that... | 05/11/2004 |
| 6576877 | Induction processing with the aid of a conductive shield A method for induction heating a workpiece made of a material such as ferrous material or alloy is carried out by placing a non-magnetic conductive shield in proximity to a current concentrating surface of the workpiece and exposing the workpiece with a s... | 06/10/2003 |
| 6548793 | Apparatus and method of inductively heat treating a beveled gear An apparatus and method to inductively heat beveled gear teeth. An inductor has an annular body with a plurality of projections for meshingly engaging beveled of the gear. An inductor coil or loop is associated with each of the projections and is at least... | 04/15/2003 |
| 6399928 | Device for hardening cylindrical bearing points of a shaft An apparatus for hardening cylindrical bearing faces (L) of a shaft (K), wherein at least one of the transitional radii (R1, R2) to the adjoining shaft portions (W1, W2) is constructed recessed, includes a pair of inductive heating units (1, 2), which are... | 06/04/2002 |
| 6291807 | In-situ closed loop temperature control for induction tempering A method and apparatus for in-situ induction tempering is provided in which an induction coil is used to temper a part in-situ at the location. The use of an induction coil in-situ at the heat treating location eliminates the need (and time and expense) o... | 09/18/2001 |
| 6140625 | Device for rotating and simultaneous hardening by electric induction The invention relates to the rotary and simultaneous electroinductive hardening of the bearing surfaces (2a; 3a) of crank pins (2; 3) of a crankshaft (1) disposed immediately one beside the other and offset in relation to one another in the axial directio... | 10/31/2000 |
| 6011246 | Induction-heating device for surface treating the teeth of a mechanical part An induction heating device for surface treating the teeth (11) of a mechanical part on which each tooth (111) has a projecting tip (111s) and a tooth root linking the tooth to an adjacent tooth, wherein an in duction coil (12, 12') is spaced from the too... | 01/04/2000 |
| 5473960 | Steering rack shaft and method of manufacturing the same A steering rack shaft having a shaft body and rack teeth formed in a predetermined axial region of the shaft body. This steering rack shaft is formed such that a workpiece is quenched, and is then heated for a predetermined time at a temperature exceeding... | 12/12/1995 |
| 5414246 | Apparatus for scaleless induction heating A method and apparatus for carrying out scaleless inductive heating of ferrous parts comprising (i) using an integrated manifold-inductor quenchant device, and while gradually flowing a diluted combustible gas into the spacing between the inductor and par... | 05/09/1995 |
| 5391862 | Induction heating system for a near net shaped gear blank An apparatus is disclosed for performing thermomechanical processing of gears in which precise control of the thermal, metallurgical and mechanical action during the forming process is maintained. The apparatus comprises an induction heating system which ... | 02/21/1995 |
| 5360963 | Apparatus for and method of induction-hardening machine components An induction-hardening machine for the contour hardening of cross-axis, intersecting-axis and nonintersecting-axis gears such as hypoid gears includes a programmable logic control unit, a source of quench liquid and a high-frequency induction generator wh... | 11/01/1994 |
| 5266765 | Apparatus and method of induction-hardening machine components with precise power output control An induction-hardening machine for the contour hardening of machine components such as gears includes a system processor which controls thyristor power switching circuits which supply high-power signals to an RF generator. Power switching circuits include... | 11/30/1993 |
| 5247145 | Method of induction-hardening machine components An induction-hardening machine for the contour hardening of cross-axis, intersecting-axis and nonintersecting-axis gears such as hypoid gears includes a programmable logic control unit, a source of quench liquid and a high-frequency induction generator wh... | 09/21/1993 |
| 5247150 | Apparatus for induction-hardening machine components An induction-hardening machine for the contour hardening of cross-axis, intersecting-axis and nonintersecting-axis gears such as hypoid gears includes a programmable logic control unit, a source of quench liquid and a high-frequency induction generator wh... | 09/21/1993 |
| 5242514 | Method for the production of a hardened guide shaft for a linear guide A method for the production of a hardened guide shaft for linear guide is disclosed, in which teeth are formed in a shaft, which is then passed through a circular inductor without rotation. The magnetic flux of the circular inductor is controlled to reduc... | 09/07/1993 |
| 5213636 | Method and apparatus of quench hardening of gear teeth surfaces A method for induction heating and quench hardening of helical gears provides a hardness pattern uniformly distributed to a controlled depth across and between the teeth surfaces by means of axial scanning of the workpiece and uniform quenching. Uniform q... | 05/25/1993 |
| 5124517 | Method of induction-hardening machine components An induction-hardening machine for the contour hardening of cross-axis, intersecting-axis and nonintersecting-axis gears such as hypoid gears includes a programmable logic control unit, a source of quench liquid and a high-frequency induction generator wh... | 06/23/1992 |
| 5053596 | Apparatus and method of induction-hardening machine components with precise power output control An induction-hardening machine for the contour hardening of machine components such as gears includes a system processor which controls thyristor power switching circuits which supply high-power signals to an RF generator. Power switching circuits include... | 10/01/1991 |
| 4894501 | Method and apparatus for induction heating of gear teeth A method and apparatus for induction heating and quench hardening of an undulating cylindrical surface, such as that defined by gear or sprocket teeth, provide a hardness pattern uniformly distributed to a controlled depth across and between the teeth sur... | 01/16/1990 |
| 4855551 | Method and apparatus for hardening gears Method and apparatus for hardening the outwardly facing teeth surfaces of a gear is disclosed. First and second induction heating coils with power sources controlled by an appropriate microprocessor preheat the gear when in the first coil at precisely con... | 08/08/1989 |
| 4855556 | Method and apparatus for hardening gears and similar workpieces A method and apparatus for progressively hardening an elongated workpiece having an outer generally cylindrical surface concentric with the central axis including the concept of providing closely spaced first and second induction heating coils each having... | 08/08/1989 |
| 4845328 | Apparatus for and method of induction-hardening machine components An induction-hardening machine for the contour hardening of machine components such as gears includes a machine with both high-frequency and low-frequency induction generators operably arranged with corresponding induction coils positioned at a machine wo... | 07/04/1989 |
| 4808779 | Single cycle, single frequency induction contour hardening process The present invention discloses a method for contour hardening a gear by means of induction heat treatment in a single heating cycle, using a single frequency of induction current. The typical frequency of alternating current is 50 KHz, applied in a singl... | 02/28/1989 |
| 4785147 | System for hardening gears by induction heating An apparatus for hardening the outwardly facing teeth surfaces of a gear is disclosed. First and second induction heating coils with power sources controlled by an appropriate microprocessor heat the gear when in the first coil at a precisely controlled c... | 11/15/1988 |
| 4757170 | Method and apparatus for induction heating gears and similar workpieces A method and apparatus for progressively hardening an elongated workpiece having an outer generally cylindrical surface concentric with the central axis including the concept of providing closely spaced first and second induction heating coils each having... | 07/12/1988 |
| 4749834 | Method and apparatus of hardening gears by induction heating A method of hardening the radially, outwardly facing surfaces of a generally circular, toothed workpiece adapted to rotate about a central axis generally concentric with the outwardly facing surfaces whereby the extremities of the surfaces define an outer... | 06/07/1988 |
| 4746101 | Induction hardening of gear teeth There is disclosed a process and apparatus for induction hardening of the flank, root and tip surfaces of the teeth of a gear so as to provide surface-hardened layer along said surfaces. An electrically energizable inductor head carries out traversing mov... | 05/24/1988 |
| 4675488 | Method for hardening gears by induction heating A method of hardening the radially, outwardly facing surfaces of a generally circular, toothed workpiece adapted to rotate about a central axis generally concentric with the outwardly facing surfaces whereby the extremities of the surfaces define an outer... | 06/23/1987 |
| 4639279 | Single frequency induction hardening process The teeth and roots of a gear are contour hardened by induction at a single work station with a single solid state power supply. The inductor or coil is full-faced and encircles the gear during the preheat and final heat steps of the process. The power su... | 01/27/1987 |
| 4589935 | Method of induction hardening of gear teeth Disclosed is a process and apparatus for induction hardening of the flank, root and tip surfaces of gear teeth so as to provide a surface-hardened layer along said surfaces. An electrically energizable inductor head carries out movement along the space be... | 05/20/1986 |
| 4363946 | Inductor for inductively heating raceways of antifriction bearing rings A method of and inductor for inductively heating a nose or projection and its transition areas, which nose or projection serves as raceway surfaces and extends around an anti-friction bearing ring and has a rectangular cross section. The inductive heat su... | 12/14/1982 |
| 4251704 | Unit for induction heating and hardening gear teeth An induction heating unit is disclosed which is operable to inductively heat and harden teeth on circumferentially extending radially thin flange segments of a gear. The unit includes an inductor conforming in circumferential contour and length to the fla... | 02/17/1981 |
| 4251705 | Inductor for hardening gear teeth An inductor for heating the circumferentially opposed working surfaces and the root surface between adjacent gear teeth includes a nose portion received between the adjacent teeth and having a profile corresponding to that of the working and root surfaces... | 02/17/1981 |
| 4123642 | Apparatus for induction hardening gear teeth Apparatus for obtaining full tooth width induction hardening of gear teeth. The method comprises attaching gear teeth shaped non-magnetic material templates to the opposite sides of the gears in close proximity to but spaced from the sides of the gear tee... | 10/31/1978 |
