Patents by Inventor John Malcolm Lee

John Malcolm Lee 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).

  • Removal of heavy metals from aqueous solutions
    Patent number: 4048283
    Abstract: Aqueous process streams or waste waters destined for merging with public waters sometimes contain deleterious amounts of heavy metals, e.g., lead (Pb) compounds. The heavy metal compounds may be substantially removed or reduced to harmless levels by treating the acidic aqueous streams with chromate or dichromate ions, then heating the solution to oxidize organics and/or heavy metal-organics, then raising the pH to an alkaline pH to precipitate the heavy metal chromate, and separating the heavy metal chromate from the aqueous stream.
    Type: Grant
    Filed: June 4, 1976
    Date of Patent: September 13, 1977
    Assignee: The Dow Chemical Company
    Inventor: John Malcolm Lee