Patents by Inventor Douglas T. Ngai

Douglas T. Ngai 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).

  • Reflow oven and methods of treating surfaces of the reflow oven
    Patent number: 9662731
    Abstract: A reflow oven includes a chamber housing including surfaces that are in contact with heated air mixed with contaminants, including flux, and a water-soluble layer selectively applied to the surfaces of the chamber housing. Embodiments of the reflow oven include an acrylic-based layer, such as an acrylic paint. In one embodiment, the acrylic paint includes a water-soluble polymer, a polymer emulsion, and water. The water-soluble polymer includes butyl benzyl phthalate. In some embodiments, the acrylic paint includes 1-10% by weight butyl benzyl phthalate, 30-55% by weight acrylic polymer emulsion, and balance water. In a certain embodiment, the acrylic paint includes 1-5% by weight butyl benzyl phthalate, 35-50% by weight acrylic poly emulsion, and balance water. Methods of treating surfaces of the reflow oven are further disclosed.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: May 30, 2017
    Assignee: Illinois Tool Works Inc.
    Inventors: Douglas T. Ngai, Joo Yong Tay, Wen-Feng Liu, Roberto P. Loera, Steven Dwade Cook
  • REFLOW OVEN AND METHODS OF TREATING SURFACES OF THE REFLOW OVEN
    Publication number: 20150129642
    Abstract: A reflow oven includes a chamber housing including surfaces that are in contact with heated air mixed with contaminants, including flux, and a water-soluble layer selectively applied to the surfaces of the chamber housing. Embodiments of the reflow oven include an acrylic-based layer, such as an acrylic paint. In one embodiment, the acrylic paint includes a water-soluble polymer, a polymer emulsion, and water. The water-soluble polymer includes butyl benzyl phthalate. In some embodiments, the acrylic paint includes 1-10% by weight butyl benzyl phthalate, 30-55% by weight acrylic polymer emulsion, and balance water. In a certain embodiment, the acrylic paint includes 1-5% by weight butyl benzyl phthalate, 35-50% by weight acrylic poly emulsion, and balance water. Methods of treating surfaces of the reflow oven are further disclosed.
    Type: Application
    Filed: January 20, 2015
    Publication date: May 14, 2015
    Inventors: Douglas T. Ngai, Joo Yong Tay, Wen-Feng Liu, Roberto P. Loera, Steven Dwade Cook