Patents by Inventor Woo Sik Yoo

Woo Sik Yoo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6303906
    Abstract: A heating apparatus and method for isothermally distributing a temperature across the surface of a semiconductor device during processing. Specifically, a chamber is provided defining a cavity, which is configured to receive a single semiconductor wafer. A plurality of resistive heating elements are provided and advantageously arranged in the cavity. The heating elements are disposed across the chamber and are aligned in close proximity to one another so as to provide an even heating temperature distribution. In accordance with the present invention, the cavity is divided into heating zones. The resistive heating elements are each individually assigned to a zone and are independently controllable. By individually varying the amount of energy emanating from each resistive heating element, an isothermal temperature distribution may be generated across each zone.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: October 16, 2001
    Assignee: WaferMasters, Inc.
    Inventor: Woo Sik Yoo
  • Patent number: 6271459
    Abstract: A semiconductor processing system and method, which uses heat energy typically wasted in most common semiconductor processing systems, to generate power. The present invention includes a heat management system, which uses the waste heat and/or the excess heat generated by a thermal-processing chamber, to generate a current from a first thermoelectric device. The current from the first thermoelectric device is then delivered to a second thermoelectric device. The second thermoelectric device, driven by the current from the first thermoelectric device, can be used to remove heat from a cooling chamber or else add heat to another processing chamber.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: August 7, 2001
    Assignee: WaferMasters, Inc.
    Inventor: Woo Sik Yoo
  • Patent number: 6246031
    Abstract: A heating apparatus, system, and method for isothermally distributing a temperature across a semiconductor device during processing. The present invention provides a furnace assembly, which includes a processing chamber configured to removably receive a plurality of semiconductor wafers. The invention includes a first heating circuit and a second heating circuit. In accordance with the present invention, the first heating circuit provides a variable temperature, which may be controlled during processing. The second heating circuit provides a constant temperature. The temperature of the first heating circuit can be adjusted to keep the process chamber temperature at the constant and uniform level provided by the second heating circuit. The wafer carrier is positioned vertically within the processing chamber using an actuation mechanism. After the wafers are processed, the actuation mechanism is used to remove the wafer carrier from the process chamber.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: June 12, 2001
    Assignee: WaferMasters, Inc.
    Inventor: Woo Sik Yoo
  • Patent number: 6240729
    Abstract: An apparatus for converting thermal energy to mechanical motion including a frame mounted onto an axle above a heat source. A flow circuit including at least three elongate chambers connected by fluid conduits is mounted onto the frame, and one-way valves provided in the flow circuit permit one-way fluid flow within the flow circuit. The heat source heats a motive fluid contained within the chambers beyond its boiling point, which increases the vapor pressure within the heated chamber, thereby forcing fluid out of the chamber and into the chamber immediately downstream in the flow circuit. The increased weight of the downstream chamber creates a torque about the axle, rotating the frame in an upstream direction.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: June 5, 2001
    Assignee: WaferMasters Incorporated
    Inventors: Woo Sik Yoo, Taro Yamazaki
  • Patent number: 6212088
    Abstract: An adapter used in conjunction with voltage modules to provide multiple and variable DC output voltages. The adapter may include a circuit for stepping down an AC input voltage to lower AC output voltages. A voltage module is provided having an interface bus, configured to be coupleable to a distribution bus on the voltage adapter. Preferably, the voltage module includes AC-DC conversion circuitry, such that the AC output voltages received from the adapter may be converted to DC voltages. Once the adapter and voltage module are coupled together, the voltage module allows the user to select among the multiple DC output voltages provided. In some embodiments, the adapter includes additional circuitry for converting the stepped-down AC voltages into DC output voltages. Additional separate voltage modules may be coupled to the first voltage module, in series, to form a modular stack of voltage modules. Like the first voltage module, the second voltage module may have a selectable output voltage, as well.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: April 3, 2001
    Assignee: WaferMasters Incorporated
    Inventor: Woo Sik Yoo