Patents by Inventor Maybin Simfukwe

Maybin Simfukwe 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).

  • Reduced leaching of arsenic and/or mercury from solid wastes
    Patent number: 5360632
    Abstract: Solid waste material which contains arsenic and/or mercury impurities is encapsulated in a cured polysulfide polymer so as to alleviate leaching of arsenic and/or mercury into aqueous liquids. Preferably, the solid waste material is first extracted with an alcohol such as ethanol or, alternatively, treated with an oxidizing agent such as aqueous hydrogen peroxide and then substantially dried before the encapsulation with the polymer is carried out.
    Type: Grant
    Filed: August 10, 1993
    Date of Patent: November 1, 1994
    Assignee: Phillips Petroleum Company
    Inventors: Marvin M. Johnson, Maybin Simfukwe, Gerhard P. Nowack, Donald H. Kubicek