Patents by Inventor Patrick S. Tam

Patrick S. Tam 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).

  • Process for purifying hydrocarbonaceous oils
    Patent number: 4485007
    Abstract: A process for purifying hydrocarbonaceous oils containing heteroatom sulfur and heteroatom nitrogen compound impurities comprising the steps of:(1) reacting said hydrocarbonaceous oil with an oxidizing gas containing at least one nitrogen oxide with more than one oxygen atom for each nitrogen atom while maintaining(a) the molar ratio of the nitrogen oxide to the total of the sulfur heteroatom content and the nitrogen heteroatom content to about 1.5:1 or less,(b) the reaction time to about one hour or less,(c) the temperature to about 100.degree. C.
    Type: Grant
    Filed: June 15, 1982
    Date of Patent: November 27, 1984
    Assignee: Environmental Research and Technology Inc.
    Inventors: Patrick S. Tam, James R. Kittrell