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| Number | Title | Issue Date |
| 4906811 | Process and device for igniting an arc with a conducting plasma channel Process and device for creating a conducting channel for igniting of an arc in an environment with reduced pressure by means of high voltage. During ignition the conditions for ignition of the arc are optimized at a number of points between the parts wher... | 03/06/1990 |
| 4901720 | Power control for beam-type electrosurgical unit An electrosurgical generator in an electrosurgical unit (ESU) controls the repetition rate and the energy content of bursts of RF energy delivered to a gas jet supplied by the ESU, in order to maintain RF leakage current within acceptable limits while sti... | 02/20/1990 |
| 4885455 | Process for terminating closed through-hole plasma arc welding To terminate welding, the mean energy of the arc is first reduced to obtain plugging of the hole, then this energy is briefly increased before again being decreased. Application to plasma arc welding of carbon steels.... | 12/05/1989 |
| 4861963 | Plasma arc torch disconnect and visible indicia means In a plasma arc torch having an elongated nozzle with an arc constricting orifice of predetermined diameter and electrical control circuit for regulating the operation of the plasma arc torch, there is provided a visible indicia or light associated with a... | 08/29/1989 |
| 4839499 | System for supplying power to different cutting torches The housing of the cutting torch power supply has an opening and a drawer which can be slid into and out of the opening. The back wall of the drawer carries a connector plug adapted for connection to the torch connectors and connections to a gas source, a... | 06/13/1989 |
| 4833293 | Plasma nitrogen fixation with short path heat transfer In this invention the fixation of nitrogen by means of an electric plasma is made more energy efficient by the transfer of heat energy rapidly and directly from the product gases of the plasma to the reactant gases entering the plasma thereby rapidly cool... | 05/23/1989 |
| 4818836 | Power supply for a three-phase plasma heating unit A power supply for a three-phase plasma heating unit includes a three-phase transformer having a primary winding group with taps which are switched under load. The transformer also has secondary winding groups which are offset by a 60° phase angle, the s... | 04/04/1989 |
| 4814577 | Control circuit in plasma arc cutting and welding equipment designed for transferred arc operation The circuit comprises a transformer and a rectifier, and is used in conjunction with a torch the electrode of which is wired to one of the output terminals of the rectifier; the nozzle is connected to the remaining terminal by way of a resistor. A compara... | 03/21/1989 |
| 4808795 | Method of continuously overheating large volumes of gas A method of continuously overheating large volumes of gas wherein a gas flow is heated in a cylindrical pipe by means of an electric arc generated between two electrodes arranged in the pipe and axially spaced from each other, the gas being introduced in ... | 02/28/1989 |
| 4795880 | Low pressure chemical vapor deposition furnace plasma clean apparatus Cleaning of low pressure chemical vapor deposition (LPCVD) furnaces is accomplished "in-situ" at furnace operating temperatures. Radio frequency (RF) power is coupled into reactive gases, that have been metered into the evacuated furnace tube, using the f... | 01/03/1989 |
| 4795882 | Torch positioning apparatus A torch positioning apparatus controls a torch as it moves downward at a relatively rapid rate toward a work piece until it trips a proximity switch, causing the rate of travel of the torch to be slowed. The torch continues its travel until it strikes the... | 01/03/1989 |
| 4788409 | Method of and apparatus for automatically conducting all position plasma welding of pipes A plasma welding method has successive steps including pre-heating of members to be welded, tack welding of the members for tentatively fixing these members, keyhole welding for completely welding the members to each other, and finish padding. These steps... | 11/29/1988 |
| 4788408 | Arc device with adjustable cathode An arc plasma generating system includes components for adjusting spacing between the cathode and the anode. A piston affixed to the cathode is slidingly positioned in a cylinder partitioning therein a first chamber and a second chamber. The first chamber... | 11/29/1988 |
| 4775774 | Plasma arc welding apparatus Plasma arc welding apparatus including a plasma torch having a body defining a flow passage for plasma gas an orifice through which plasma gas exits the torch as a high-temperature jet stream utilizes an actuatable slope control valve operatively connecte... | 10/04/1988 |
| 4767908 | Plasma arc welding and cutting torch designed for non-transferred and transferred arc operation The invention relates to a torch for plasma arc welding and cutting operations carried out on metal, which comprises a hollow grip, to which two power supply conductors are connected together with tubes supplying plasma-forming gas and coolant, a cylindri... | 08/30/1988 |
| 4767907 | Method of igniting arcs by projection of ignition-plasma to the cathode A method of igniting arcs wherein an electric field is formed in the vicinity of an electrode and ignition-plasma is projected against a cathode in the electric field, to thereby ignite an arc.... | 08/30/1988 |
| 4766287 | Inductively coupled plasma torch with adjustable sample injector An induction plasma system comprises a torch and an induction coil. A sample substance is injected into the plasma at an axial position that is adjustable while the plasma is being energized. The plasma-forming gas flows through the induction coil prior t... | 08/23/1988 |
| 4766286 | Arc length control for plasma welding For use with plasma arc welding apparatus, a control system is set forth. The plasma arc welding apparatus includes a plasma arc power supply (12), a contactor (20), and an electrode assembly for moving the electrode (32) relative to a work piece (22). Th... | 08/23/1988 |
| 4724296 | Plasma generator A multi-electrode plasma generator is arranged with each electrode held at a potential with respect to ground that is a fraction of the breakdown potential so that no spurious discharges to ground are possible. The potential between electrodes exceeds the... | 02/09/1988 |
| 4701590 | Spring loaded electrode exposure interlock device A plasma-arc torch is provided having a spring loaded ejector mechanism for expelling the electrode and thereby breaking off electrical contact so as to prevent operation of the torch when necessary parts are not in place.... | 10/20/1987 |
| 4692584 | Gas control system for a plasma arc welding apparatus Plasma arc welding apparatus including a plasma torch having a body defining a flow passage for plasma gas an orifice through which plasma gas exits the torch as a high-temperature jet stream utilizes an actuatable slope control valve operatively connecte... | 09/08/1987 |
| 4692582 | Plasma welding or cutting system provided with a delay The plasma welding or cutting system comprises in particular a torch (2), a nozzle (3), a gas supply for the torch for supplying the torch with a plasma-producing gas, and an electrical supply for the torch for creating, maintaining or breaking an electri... | 09/08/1987 |
| 4683367 | Method and device for controlling the erosion of the electrodes of a plasma torch Method and device for controlling the erosion of the electrodes of a plasma torch, in which an electrical arc is produced when the electrodes are connected to an electrical supply. An axial magnetic field generated by a system of field coil causes the rot... | 07/28/1987 |
| 4682004 | Measuring arrangement having a capacitive measuring electrode and a working tool with integrated electrode In a measuring arrangement for measuring or regulating spacing on thermal working machines (for example, flame cutting installations), two capacitive electrodes are arranged at different spacings from the workpiece. Interference signals can result from ch... | 07/21/1987 |
| 4678888 | Power circuit apparatus for starting and operating plasma arc An apparatus for starting and maintaining a plasma arc is disclosed, which comprises a plasma arc torch composed of a rear electrode and a front tubular member, with the tubular member acting as a collimator in transfer arc operation or as an electrode in... | 07/07/1987 |
| 4672170 | Apparatus for thermochemical treatments of metals by ionic bombardment Apparatus for thermochemical treatment of metals with accurate control of the treatment temperature in a furnace having a structure similar to that of a classic furnace for thermal or thermochemical treatment in a rarified atmosphere, equipped with a cont... | 06/09/1987 |
| 4663515 | Plasma-arc torch interlock with flow sensing A plasma-art torch interlock with flow sensing is provided. A flow rate sensor is included within the conduit supplying working fluid to a plasma-arc torch. By sensing an increase in flow rate of the working fluid which is caused by a necessary part being... | 05/05/1987 |
| 4656331 | Infrared sensor for the control of plasma-jet spray coating and electric are heating processes A multi-purpose optical sensor operates in the medium-to-far infrared wavelength spectral region to sense the surface temperature of plasma-jet spray coating materials. This plasma itself emits little or no radiation in this region and, accordingly, the o... | 04/07/1987 |
| 4642440 | Semi-transferred arc in a liquid stabilized plasma generator and method for utilizing the same A plasma generator arrangement for applying material to an electrical conductive substrate and method for utilizing the same. The generator arrangement comprises a generator for creating and extending towards the substrate a plasma stream containing the m... | 02/10/1987 |
| 4640627 | Apparatus for monitoring a plasma torch An apparatus for monitoring a plasma torch includes a dedicated photometer which produces a signal representative of the temperature of a quartz tube of the torch, which signal can be used to reduce the temperature thereof.... | 02/03/1987 |
| 4629940 | Plasma emission source An impedance matching network for continuously and automatically maximizing RF power transfer to a plasma emission torch includes a dual phase detector network. Signals from the detector network control, via a control unit, a variable impedance network.... | 12/16/1986 |
| 4609810 | Apparatus for controlling a plasma An apparatus for controlling a plasma discharge includes a light gathering tube remotely directed at the plasma discharge. The gathered light is transmitted, via a filter optic light pipe, to a detector that produces a signal that is compared with at leas... | 09/02/1986 |
| 4585921 | Torch operation interlock device The present invention minimizes shock hazard in using a touch start plasma torch. The resistance between the torch tip and the workpiece is compared to a predetermined value set by estimating the resistance between a person's hand to ground under the most... | 04/29/1986 |
| 4580029 | Plasma arc power supply and method A plasma arc system for plasma arc welding and cutting including a plasma arc torch in circuit with a constant current power supply comprising a transformer having a primary winding and at least one secondary winding with the primary winding connected to ... | 04/01/1986 |
| 4567345 | Process and apparatus for the in-line inspection of the depth of a weld by a pulse beam A process for the in-line inspection of the depth of a weld carried out by a welding beam pulse in which around its impact point on a workpiece, the beam pulse produces a welding plasma wherein, only during the emission of a welding beam pulse, at least o... | 01/28/1986 |
| 4446560 | High power electric generator, especially adapted for powering processes involving discharge in a rarified atmosphere A high power generator for an ion discharge device used for the thermal treatment of metals in a rarified gaseous atmosphere. A variable width pulse generator is used to vary the input power to an inductance means. The frequency of the input pulses is hel... | 05/01/1984 |
| 4410792 | Glow discharge heating apparatus Typically, a bottom of a cup-shaped electrode opposes to that of a similar electrode through a predetermined gap and in a mixture of helium and hydrogen. A step-up transformer connected across an AC source through a resistor applies a voltage in excess of... | 10/18/1983 |
| 4371775 | Method and apparatus for plasma welding The invention relates to a method and an apparatus to perform plasma welding, by providing a cooling water temperature detector at the inlet side of cooling water in the plasma welding torch, controlling the temperature at the inlet side of the cooling wa... | 02/01/1983 |
| 4330700 | Plasmaburner with contact protection There is disclosed a plasma burner which has contact protection for protecting the operator against impermissibly high voltage and the burner head itself against destruction. The plasma burner comprises a burner shaft, a nozzle and a nozzle cap surroundin... | 05/18/1982 |
| 4284871 | Automatic adjustment of the initial height of a flame cutter to a workpiece The initial height of a flame cutter to a workpiece located under a liquid is automatically adjusted by jointly moving the flame cutter and a sensor toward the workpiece before the cutting operation until the sensor touches the workpiece surface whereupon... | 08/18/1981 |
