Patents by Inventor Ming K. Li

Ming K. 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).

  • Purification of bisphenol-A
    Patent number: 4408087
    Abstract: Pure bisphenol-A can be obtained by treating the adduct of the latter and phenol with water in two stages.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: October 4, 1983
    Assignee: General Electric Company
    Inventor: Ming K. Li
  • Purification of bisphenol-A
    Patent number: 4294993
    Abstract: Pure bisphenol-A can be obtained by treating the adduct of the latter and phenol with either toluene or a mixture of toluene and water.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: October 13, 1981
    Assignee: General Electric Company
    Inventor: Ming K. Li
  • Purification of bisphenol-A
    Patent number: 4294994
    Abstract: Pure bisphenol-A can be obtained by subjecting the adduct of the latter and phenol to spray drying conditions and recovering the bisphenol-A from the released phenol. The use of an inert liquid carrier for the adduct, such as acetone, facilitates the desired separation and purification of the bisphenol-A.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: October 13, 1981
    Assignee: General Electric Company
    Inventor: Ming K. Li
  • Purification of bisphenol-A
    Patent number: 4156098
    Abstract: Impure bisphenol-A can be purified by treatment of a phenol adduct of the latter with methylene chloride and then recovering the purified bisphenol-A.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: May 22, 1979
    Assignee: General Electric Company
    Inventor: Ming K. Li
  • Purification of dichloroethylene compound
    Patent number: 4137421
    Abstract: Impure 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene can be purified by heating the latter either with phenol alone or with a mixture of methylene chloride and phenol, allowing the heated mixture to cool until crystallization occurs and removing the above-identified purified dichloroethylene compound.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: January 30, 1979
    Assignee: General Electric Company
    Inventors: Ming K. Li, Michael R. MacLaury