Patents by Inventor Chung-Lee Li

Chung-Lee Li 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).

  • Method of removal and recovery of oil and grease from wastewater
    Patent number: 5244580
    Abstract: There is disclosed a method of removal and recovery of oil and grease from wastewater wherein ferrite powders are used to adsorb the oil and grease contained in the wastewater, and then the oil and grease are separated from the wastewater by an external magnetic field. The ferrite powders are individually recovered for re-use.
    Type: Grant
    Filed: January 10, 1992
    Date of Patent: September 14, 1993
    Inventor: Chung-Lee Li
  • Method of producing magnetic powders from heavy metal sludges
    Patent number: 5221323
    Abstract: A preparation method of magnetic powders by using ferric compounds added to heavy metal sludges, and then heating under an atmosphere control and at adequate temperature so as to convert heavy metal sludges into magnetic ferrite powders. Owing to the obtained magnetic ferrite powders possess strong surface activity and cannot dissolve in weak acid or alkaline solution, they can be widely applied on waste water treatments.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: June 22, 1993
    Inventor: Chung-Lee Li