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| Number | Title | Issue Date |
| 7167773 | Process and apparatus for improving and controlling the curing of natural and synthetic moldable compounds A process for curing a moldable compound under a plurality of curing conditions by: (1) obtaining time dependent data streams of dielectric or impedance values from a plurality of sensors distributed within a curing mold, wherein the moldable compound is a dialectri... | 01/23/2007 |
| 7068050 | Moisture and density detector (MDD) A Moisture and Density Detector (MDD) provides a method and apparatus to determine the moisture content and/or density, as well as presence and location of anomalies, and/or wood type of any dielectric material for various purposes. This device is very useful in det... | 06/27/2006 |
| 7012232 | RF welding device An RF welder is disclosed that has circuitry that automatically affects system impedance so that, throughout the welding or embossing cycle, a generator is capable of sending energy through die and fabric at a predetermined frequency and cabling is capable of dissip... | 03/14/2006 |
| 6914226 | Oven for heating a product with RF energy RF energy provided by electrodes positioned between a product is used to heat a product that exhibits a variable impedance during the heating process. As the product's impedance changes during the heating process, RF heating system impedance can be maintained consta... | 07/05/2005 |
| 6124584 | Moisture measurement control of wood in radio frequency dielectric processes A method of determining the moisture content of charge of wood having a moisture content below fiber saturation and being subjected to a Radio Frequency dielectric heating process to the degree required to control the process (e.g., terminate drying) by m... | 09/26/2000 |
| 5906766 | Method for dielectrically heating an adhesive A method of heating an adhesive including the steps of placing a dielectrically heatable adhesive between first and second members. A high frequency electric field is applied between the first and second members sufficient to dielectrically heat the adhes... | 05/25/1999 |
| 5834746 | Method and apparatus for heating products by means of high-frequency electromagnetic waves The invention relates to a method for the heat treatment of meat products in a feeding element (4) by means of high-frequency electromagnetic waves, and an apparatus for the execution of the method. The invention also relates to an advantageous applicatio... | 11/10/1998 |
| 5750970 | Method for dielectrically heating an adhesive A method of heating an adhesive including the steps of placing a dielectrically heatable adhesive between first and second members. A high frequency electric field is applied between the first and second members sufficient to dielectrically heat the adhes... | 05/12/1998 |
| 5695671 | System and process for controlling dielectric ovens A control system for controlling the heating of a product in a dielectric oven comprises at least one dielectric heating circuit including an electromagnetic energy source, such as a triode vacuum tube, having an anode and a resonant circuit including at ... | 12/09/1997 |
| 5556567 | System and process for controlling dielectric ovens A control system for controlling the heating of a product in a dielectric oven comprises at least one dielectric heating circuit including an electromagnetic energy source, such as a triode vacuum tube, having an anode and a resonant circuit including at ... | 09/17/1996 |
| 5506391 | Liquid heater using electrical oscillations A diathermal water heater for the rapid and controlled heating of water and like fluids. A diathermal heating chamber uses electrical oscillations to heat liquids flowing through it. By means of feedback circuitry, the electrical oscillations are controll... | 04/09/1996 |
| 5420404 | Apparatus and continuous process for drying of dielectric materials An apparatus and method for drying, by heating, a continuous supply of dielectric material. A terminated, quarter-wavelength transmission line is used as a "traveling wave" applicator for transferring electromagnetic energy from a radio-frequency generato... | 05/30/1995 |
| 5300749 | Method and apparatus for the reduction of distance-dependent voltage increase of parallel high-frequency electrodes The invention concerns a method and equipment for the compensation of voltage increase in electrodes of a apparatus used to process dielectric materials. In the apparatus the electrodes are arranged parallel, at a constant distance from each other across ... | 04/05/1994 |
| 5293936 | Optimum antenna-like exciters for heating earth media to recover thermally responsive constituents Optimum antenna-like exciters for heating earth media which may be used to recover hydrocarbons. A high frequency power supply is connected to an exciter emplaced in the subsurface formation which radiates high frequency power. The exciters include one or... | 03/15/1994 |
| 5290986 | Thermally assisted shorts removal process for glass ceramic product using an RF field Thermally assisted processes for removing internal defects in glass ceramic products, specifically electrical shorts formed in a substrate during product fabrication, are set forth. According to one aspect of the invention, a method for repairing shorts b... | 03/01/1994 |
| 5278382 | Method for the high-frequency heating of dielectric workpieces A method for the heating and joining together, preferably for welding, of workpieces by use of a generator. Where, during a heating interval the generator supplies high-frequency energy to at least two electrodes disposed on the workpiece and where the en... | 01/11/1994 |
| 5266762 | Method and apparatus for radio frequency ceramic sintering Radio frequency energy is used to sinter ceramic materials. A coaxial waveguide resonator produces a TEM mode wave which generates a high field capacitive region in which a sample of the ceramic material is located. Frequency of the power source is kept i... | 11/30/1993 |
| 5256845 | Apparatus for sealing medical plastic tubing with high frequency dielectric heating Spurious emission from an apparatus for sealing medical tubing is prevented by providing a tuned circuit of capacitors and inductors between amplifier stages, by providing a low-pass filter of such resonant networks at the input and the output of the gene... | 10/26/1993 |
| 5254825 | Apparatus for the sealing of medical plastic articles The detuning of a tuned network in a sealing head of a device for sealing medical plastic articles is detected and automatically compensated to reduce the overall energy consumption and optimize the sealing process. A secondary capacitor in the tuned netw... | 10/19/1993 |
| 4978826 | High frequency oven with plural heating levels and an improved efficiency of power transfer A high-frequency dielectric oven uses a plurality of oscillating circuits, which are caused to operate in a predetermined phase relationship, to produce a higher voltage distribution within a load capacitor, thus permitting an increase in the space betwee... | 12/18/1990 |
| 4974503 | Apparatus for irradiating food products An apparatus is provided for uniformly and rapidly heating, pasteurizing and/or sterilizing food products which comprises a conveyor on which the food products are conveyed and a source of radio-frequency radiation which is directed at the food products. ... | 12/04/1990 |
| 4910371 | Method and device for dielectric reheating A process for heating by dielectric hysteresis a product (11) containing at least a proportion of ice enabling to heat and/or at least to form molecules of liquid water in said product practically without heating the liquid water obtained, consisting in s... | 03/20/1990 |
| 4884043 | High-frequency generator A high-frequency generator 1 includes a multigrid electron tube (2). A current source circuit (10) is connected to the control grid (3) or the screen grid (4) of the electron tube (2) and is arranged as an optionally adjustable current source which is als... | 11/28/1989 |
| 4873407 | Dielectric cross machine moisture control In a method for applying heat to a web, the web is subjected to dielectric heating in discrete segments, arranged transverse to the web, by modules containing pairs of electrodes. The heat thus generated can be used to vary the moisture and/or temperature... | 10/10/1989 |
| 4794226 | Self-regulating porous heater device A self-regulating porous heater device regulates the temperature of fluid passing through it. This device includes at least one layer of a porous material which has a magnetic permeability inversely related to temperature over a given range. Due to conduc... | 12/27/1988 |
| 4761619 | High-frequency generator with improved cathode current regulated high-frequency oscillator A high-frequency heating generator, comprising an electron tube (B) for industrial systems ranging from several kilowatts to a number of megawatts. In similar systems employing an electron tube oscillator a substantial amount of power is dissipated in at ... | 08/02/1988 |
| 4761618 | High-frequency heating generator comprising a multiple-grid electron tube A high-frequency heating generator comprising a multi-grid electron tube 15 for use in industrial systems in the range of several kilowatts to a number of megawatts. In order to obtain an economic high-frequency generator, the electron tube 15 comprises a... | 08/02/1988 |
| 4717814 | Slotted autoregulating heater Designation of specific heating zones and increase in minimum resistance relative to prior heaters of the type to which the present invention pertains is achieved, together with flexibility or bendability, if desired, by slotting the outer conductor of th... | 01/05/1988 |
| 4709701 | Apparatus for medical treatment by hyperthermia Hyperthermia apparatus including a power amplifier, remote electrode apparatus receiving a high power electrical supply from the power amplifier, power transmission apparatus arranged to electrically couple the power amplifier to the remote electrode appa... | 12/01/1987 |
| 4567340 | Apparatus and method for drying solid materials An apparatus and method for drying a solid material wherein the solid material is exposed to a radio frequency electromagnetic field such that water is expelled from the surface of the solid material as a liquid. The liquid water thus expelled is then col... | 01/28/1986 |
| 4548772 | Surface smoothing method for magnetic recording medium The surface of a flexible magnetic recording medium is continuously smoothed between at least one set of two rolls at least one of which is a metal roll. The rolls serve as electrodes of a high-frequency dielectric heater. A refrigerant is fed to the elec... | 10/22/1985 |
| 4546226 | Method and apparatus for the conveying and radio frequency processing of dielectric materials Particulate dielectric material is processed by radio frequency (RF) energy while being simultaneously conveyed from an inlet to an outlet, by disposing the transmitting and receiving electrodes of an RF generator diametrically opposite each other on the ... | 10/08/1985 |
| 4531038 | Radio frequency dielectric heater An RF dielectric heater has a variable power output and stable output frequency. A power controller provides variable phase angle control of three-phase AC power. A delta-wye power transformer is coupled between the power controller and a rectifier circui... | 07/23/1985 |
| 4504720 | High frequency generator for welding apparatus A high frequency welding device for welding plastic sheets, in which the high frequency energy is provided by fixed-frequency oscillator, preferably by using a quartz crystal amplifier, whose frequency does not change during the welding process. The outpu... | 03/12/1985 |
| 4499358 | Driving circuit for radio frequency dryer A driving circuit for supplying a radio frequency electrical signal to the applicator section of a radio frequency dryer includes a voltage controlled oscillator, supplying a signal to an amplifier circuit. The amplifier circuit supplies an amplified sign... | 02/12/1985 |
| 4488028 | Electrode mechanical tubing sealer A pair of jaws moveable with respect to one another whether mounted in a hand held sealer or desk mounted sealer, compresses, heats, elongates, spreads and welds liquid filled tubing placed therebetween. Variants of the pair of jaws provide means for seri... | 12/11/1984 |
| 4420670 | Control for dielectric heating in blow molding machine Apparatus for controlled dielectric heating a plurality of thermoplastic preforms for blow molding is provided. The apparatus controls the energization of a plurality of electrode pairs by a radio frequency generator. The generator is equipped with a load... | 12/13/1983 |
| 4406070 | Dielectric conditioning There is disclosed in the present application a method and apparatus for treating variable batches of moist dielectric materials by the application of radio frequency energy which reduces the moisture content. According to the present method and by the us... | 09/27/1983 |
| 4386578 | High velocity metallic mass increment vacuum deposit gun A vacuum deposit device for use in producing thin film depositions. A metallic mass is accelerated along a pair of rail-type electrodes. The discharge current passing through the mass during acceleration is controlled as to magnitude and time duration to ... | 06/07/1983 |
| 4384186 | Electrode sealing system for thermoplastic tube A system for hermetically sealing a thermoplastic tube during each cycle of operation of the system. A hand-holdable sealing gun has a pair of electrodes between which a tube to be sealed is placed. One of the electrodes is fixed and the other is moved by... | 05/17/1983 |
