Patents Examined by Tuan Vinh To
  • Patent number: 5324887
    Abstract: An absorber for a microwave module and method of fabrication thereof wherein an ink is provided from a mixture of powdered iron and a resin. The ink is then screen printed or mask printed onto the interior surface of the lid of the microwave module in a predetermined pattern to lower the Q of the cavities within the module. The lowered Q suppresses the electromagnetic resonance and thereby minimizes the EMI problems. Furthermore, the absorber material reduces EMI between sections of the module at frequencies where no cavity resonances occur.
    Type: Grant
    Filed: June 26, 1992
    Date of Patent: June 28, 1994
    Assignee: Texas Instruments Incorporated
    Inventors: Martin L. Catt, Gray E. Fowler, Donald L. Purinton, Leon Stiborek
  • Patent number: 5237140
    Abstract: An a-c/d-c microwave oven adapted to be connected to an a-c and/or d-c power source. The oven has an inverter for converting d-c power to a-c power to feed power to a magnetron generating high-frequency energy via a transformer. Input from the d-c and a-c power sources is selectively fed to the magnetron. A first primary winding is fed commercial a-c power. A second primary winding is fed on a-c voltage from the inverter. A secondary winding connecting to the magnetron is wound on the transformer. A predetermined voltage is adjusted in the secondary winding of the transformer by adjusting the frequency of the a-c voltage from the inverter at a higher level than the commercial a-c power, which is fed to the second primary winding.
    Type: Grant
    Filed: May 2, 1991
    Date of Patent: August 17, 1993
    Assignee: Sawafuji Electric Co., Ltd.
    Inventors: Naoki Akazawa, Makoto Gezima
  • Patent number: 5237141
    Abstract: A high frequency heating apparatus and an electromagnetic wave detector for use in the high frequency heating apparatus, are so arranged to estimate the cooking or thawing state of a food article placed in a heating chamber through detection of microwaves within the heating chamber. By devising a position of an antenna and a method of processing signals of the microwaves as detected, stably and reliable microwave detection becomes possible.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: August 17, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Koji Yoshino, Takashi Kashimoto, Kimiaki Yamaguchi, Masato Yota, Shinichi Sakai, Satomi Moriyama
  • Patent number: 5235149
    Abstract: A container for a product to be heated or cooked in an oven such as a microwave oven, whose lid comprises an upper sub-assembly (I) with a metal layer and a lower sub-assembly (II) comprising an upper heat reactivatable layer (4) affixed initially so as not to adhere against the metal layer (3) and a lower heat sealing layer (5) sealed against the peripheral flange (1). The heat reactivatable layer (4) and the heat sealing layer (5) are layers of a synthetic material which can be peeled respectively off the metal layer (3) and the peripheral flange (1). In addition the heat reactivatable layer (4) has, vertically in line with the peripheral flange (1) a peripheral portion (6) adhering to the metal layer (3) following heating thereof during sealing of the heat sealing layer (5) on the peripheral flange (1).
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: August 10, 1993
    Assignee: Societe Alsacienne d'Aluminium
    Inventor: Marianne Boehrer
  • Patent number: 5233146
    Abstract: A method and device (1) for melting an organic product (4) by microwaves. e device (1) comprises electromagnetic field produced by at least one waveguide (6) for microwaves fastened to a metal receptacle (3) containing the initial solid organic product (4). The microwaves effect the melting of the solid (4) with the formation of an upper liquid layer (11). Means (12) make it possible to erode the still solid part of the product (4) which is in contact with the liquid (11).
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: August 3, 1993
    Assignee: Compagnie Generale des Etablissements Michelin - Michelin & CIE
    Inventors: Jacques Gouttebessis, Alain Germain
  • Patent number: 5233145
    Abstract: Pouring receptacle for infusion, adapted to be placed in a microwave oven and comprising a body (1) to which is secured a handle (2) by an encircling band (3), the body (1) and the handle (2) being of a material transparent to microwaves. The encircling band (3) clamps a portion (4, 16) of the handle (2) to the body (1) and is of a material having a coefficient of expansion near that of the body, transparent to microwaves and resistant to deformation during successive thermal cycles. The band is a structure reinforced by fibers. The fibers can be applied by winding from a spool, or the band (3) can be molded and heated to expand it so it slips over the body (1) and cools and contracts to grip the body (1) firmly.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: August 3, 1993
    Assignee: Moulinex (Societe Anonyme)
    Inventor: Patrice Schiettecatte
  • Patent number: 5229563
    Abstract: A pressure cooker and a process for making the same, wherein the pressure cooker includes a pressure container for accommodating food to be cooked, a lid for covering the container in an airtight manner, a pressure control device for adjusting the internal pressure in the container, wherein the container or the lid or both are partly or wholly made of a composite resin consisting essentially of polyphenylene sulfide resin and 30 wt % to 50 wt % glass fiber.
    Type: Grant
    Filed: January 9, 1991
    Date of Patent: July 20, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mamoru Isogai, Masao Maki, Takahito Ishii, Shigeki Ueda, Satoru Kodama, Seiji Ito
  • Patent number: 5227598
    Abstract: Apparatus for selectively regenerating at least one portion of an adsorbent bed in an adsorption system with a movable microwave device while the remainder of the bed is still being used. The adsorbent bed is held by a frame which divides the bed into a plurality of sections, each section holding a portion of the adsorbent. At least one movable regeneration carriage assembly which moves from section to section is provided. The carriage assembly supports a microwave heating device which heats the adsorbent in the section adjacent to the carriage assembly. Each section can be isolated from the others in turn and be regenerated while the remaining sections continue the adsorption function. The isolated section is swept by a purge gas which is conveyed to and from the section by flexible cords connected to the carriage assembly.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: July 13, 1993
    Assignee: General Electric Company
    Inventors: Donald E. Woodmansee, James J. Carroll, Sr.
  • Patent number: 5221817
    Abstract: A heating apparatus such as microwave ovens includes a microcomputer incorporating a first storage storing data of a plurality of cooking menus and corresponding cooking information and a second storage storing data of the order of priority of selection with respect to the cooking menus. The microcomputer has another storage storing data of the number of times of execution of the respective cooking menus. The microcomputer operates to add "1" to the number of times of execution of a cooking operation when the heating operation is executed in accordance with the selected cooking menu. The microcomputer determines the order of the number of times of execution of the cooking menus. The microcomputer renews the order of priority of selection of the cooking menus in accordance with the determined order of the number of times of execution of the cooking menus.
    Type: Grant
    Filed: February 4, 1992
    Date of Patent: June 22, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Nobuaki Ota
  • Patent number: 5220142
    Abstract: A control element positioned between an object being heated and a source of microwave radiation is employed to prevent a localized concentration of microwave energy resulting from a discontinuity in the object surface. Close control is provided for heating an object with a sensitive coating.
    Type: Grant
    Filed: January 29, 1991
    Date of Patent: June 15, 1993
    Assignee: International Business Machines Corporation
    Inventors: Susan J. LaMaire, David A. Lewis
  • Patent number: 5220141
    Abstract: A microwave susceptor material which comprises a substrate such as paper or paperboard treated with a polar organic compound having microwave interactive characteristics. A salt, which is soluble in the polar organic compound, can be added to alter the microwave heating performance of the material. The invention provides susceptor materials useful for cooking food items in a microwave oven with enhancement of the quality of the cooked food, such as the browning and crisping of the food surface. The susceptor materials are formed by treatment of the substrates with the polar organic compounds under conditions that cause the polar organic compounds to penetrate the substrate.
    Type: Grant
    Filed: March 26, 1991
    Date of Patent: June 15, 1993
    Assignee: International Paper Company
    Inventors: James R. Quick, James W. Mitchell
  • Patent number: 5212360
    Abstract: A microwave oven with a power supply including a transformer having primary and secondary windings, with the primary winding having a plurality of input connections and a secondary winding being coupled to a magnetron. The microwave oven includes a circuit the magnitude of a line voltage supplied to the microwave oven and, in response thereto, for coupling the line voltage to a corresponding one of the input connections to regulate the voltage provided across the secondary winding to the same voltage level regardless of the magnitude of the line voltage.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: May 18, 1993
    Assignee: Amana Refrigeration, Inc.
    Inventor: Roger W. Carlson
  • Patent number: 5206471
    Abstract: A microwave activated gas generator in which microwave energy is supplied to an activated gas formation region through which a gas to be activated flows in a high-velocity stream. The stream is disturbed within or proximate the activation region to form a downstream stagnation region within the activated gas formation region to encourage microwave gas activation for efficiently coupling power to the gas to form a high-volume, high-velocity activated gas stream.
    Type: Grant
    Filed: December 26, 1991
    Date of Patent: April 27, 1993
    Assignee: Applied Science and Technology, Inc.
    Inventor: Donald K. Smith
  • Patent number: 5206479
    Abstract: A microwave heating system which is especially useful for rapidly, uniformly and positively sterlizing biological media, such as broths and gels used as incubation or growth media for bacteria, includes a source of microwave radiation, a microwave chamber, a container or a plurality of containers in the chamber, and a mixer for mixing the contents of the container or containers during heating. The mixer is at least partially external to the container and is capable of operating when the container is positively sealed to prevent contamination of the contents, and the mixer is preferably a combination of an external magnet and a mixing element which is at least in part of magnetic material and is moved by changes in the magnetic field set up by the magnet, as the container and contained mixing element are moved with respect to the magnet, as on an oscillating turntable.
    Type: Grant
    Filed: May 4, 1990
    Date of Patent: April 27, 1993
    Assignee: CEM Corporation
    Inventors: Zairani Zakaria, Edwin D. Neas, Dennis P. Manchester, Wyatt P. Hargett
  • Patent number: 5202541
    Abstract: A method of heating a workpiece assembly and a load assembly suitable for heating by the method. The method involves heating the workpiece assembly in a microwave cavity surrounded by one or more rings made of electrically conductive material. The rings fix the electrical field in such a way that uniform heating of the workpiece assembly can be achieved. Large workpieces or assemblies can be heated and, if sinterable, sintered in this way without the problems normally caused by lack of uniform fields when microwaves are used to heat large loads.
    Type: Grant
    Filed: January 28, 1991
    Date of Patent: April 13, 1993
    Assignee: Alcan International Limited
    Inventors: Mark C. L. Patterson, Raymond Y. Roy, Robert M. Kimber, Prasad S. Apte
  • Patent number: 5200588
    Abstract: A microwave heating apparatus includes a microwave oscillator, a waveguide for transmitting microwave energy outputted from the microwave oscillator to an object to be heated, detectors for detecting the power of the microwave energy inputted from the microwave oscillator to the object to be heated and the reflected power of the microwave energy reflected from the object to be heated, a matching stub provided in the waveguide, and a driver for driving the matching stub. The driver calculates a VSWR value from the inputted power and the reflected power and includes a motor for driving the matching stub so that the VSWR value is maintained within a predetermined range. Matching of the waveguide impedance with the load impedance can be executed automatically and the VSWR value can be maintained in the range of good matching. Thus, lowering of heating efficiency can be prevented.
    Type: Grant
    Filed: November 14, 1991
    Date of Patent: April 6, 1993
    Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
    Inventors: Isao Kondoh, Yoshiyuki Kato
  • Patent number: 5200589
    Abstract: A microwave oven having a fan motor rotation control function comprising an absolute humidity sensor for sensing the humidity inside the microwave oven, a fan motor for discharging water vapor inside the microwave oven externally, a microprocessor and a keyboard. The improved microwave oven further comprises a phototriac connected between said fan motor and a supplying line of AC power source for controlling AC power supplied to the fan motor in accordance with a plurality of control signals from the microprocessor and a zero crossing signal generating circuit for detecting a zero point from AC power voltage during a constant cycle to generate a predetermined width of pulse signal at the zero point and for applying the predetermined width of pulse signal the microprocessor.
    Type: Grant
    Filed: July 1, 1991
    Date of Patent: April 6, 1993
    Assignee: Gold Star Co., Ltd.
    Inventor: Jung R. Kim
  • Patent number: 5200590
    Abstract: Apparatus and method for popping high yield popcorn using a bag having a substantially rectangular cross section as manufactured using a conventional bag machine. A base supports the bag on edge with at least one joining panel being inclined such as, for example, at Whether the bag is initially unfolded or unfolds as a result of internal pressure caused by some kernels popping, a horizontal elongated V-shaped trough is formed as the lower-most region of the bag due to the supporting orientation of the base. Kernels form in a clump in the nadir of the trough thereby enhancing the yield of the popping, and kernels disturbed from the clump by popping kernels are directed back to the clump by the inclined walls of the bag.
    Type: Grant
    Filed: December 5, 1991
    Date of Patent: April 6, 1993
    Assignee: Raytheon Company
    Inventors: Robert F. Bowen, Robert J. Castoldi, John S. Sklenak
  • Patent number: 5189272
    Abstract: A package for use in microwave ovens is disclosed in its preferred form of a flexible, tubular bag (18) including expandable side walls (26) interconnected between bottom and top walls (20, 22). The side walls (26) include pleats (26a, 26b, 26c, 26d) which are folded in a collapsed condition of the bag (18) and expand due to internal expansion forces generated by the popping of kernels and the creation of water vapor. The openable end (28) opposite the permanent end wall (24) of the bag (18) is formed by V-shaped adhesive strips (34, 36) located between the bottom and top walls (20, 22) and the pleats (26a, 26b, 26c, 26d).
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: February 23, 1993
    Assignee: General Mills, Inc.
    Inventors: Duane L. McDonald, Barbara E. Morrissette
  • Patent number: 5189273
    Abstract: A microwave absorbing heater comprising a porous body containing silicon oxide and having a porosity of 40 to 95%.A microwave absorbing heater may be formed of a porous body having a porosity of 40 to 95% and composed of an inorganic electrical insulating material, and a silicon carbide film formed on the surface thereof.Since the microwave absorptivity is high, the dissipation of water from a heated object is easy and the heat dissipation is small, the heating efficiency is great. The thermal shock resistance is also high.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: February 23, 1993
    Assignee: Mitsubishi Materials Corporation
    Inventors: Takao Inukai, Kanichi Tachibana, Kazuo Tsukada, Toshitaka Fujikawa, Keiichi Iida, Noboru Kogure