Patents by Inventor Julia H. W. Lam

Julia H. W. Lam 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 for making diaryliodonium salts
    Patent number: 4238394
    Abstract: A method is provided for making certain diaryliodonium salt photoinitiators, based on the initial formation of a diaryliodonium bisulfate. Methylene chloride is substituted for acetic acid during the reaction between potassium iodate and benzene in the presence of acetic anhydride and sulfuric acid. The diaryliodonium bisulfate is then reacted with a counterion source, such as a metal salt, to produce the desired diaryliodonium salt which can be used as a photoinitiator. The iodonium salt photoinitiators made by the method of the present invention can be used to make UV curable compositions.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: December 9, 1980
    Assignee: General Electric Company
    Inventors: James V. Crivello, Julia H. W. Lam
  • Method for making aryl onium salts of group via elements
    Patent number: 4238619
    Abstract: A method is provided for making certain aryl onium salts of Group VIa elements useful as photoinitiators for polymerizing various organic materials. Reaction is effected between a compound of a Group VIa element, for example, an aryl or alkyl sulfide or a thiophenol or mercaptan and an aromatic iodonium salt in the presence of a copper compound catalyst or a copper compound-tertiary amine cocatalyst.
    Type: Grant
    Filed: June 6, 1979
    Date of Patent: December 9, 1980
    Assignee: General Electric Company
    Inventors: James V. Crivello, Julia H. W. Lam
  • Method for making diarylhalonium salts
    Patent number: 4151175
    Abstract: A method is provided for making certain diaryliodonium salt photoinitiators, based on the initial formation of a diaryliodonium bisulfate. Methylene chloride is substituted for acetic acid during the reaction between potassium iodate and benzene in the presence of acetic anhydride and sulfuric acid. The diaryliodonium bisulfate is then reacted with a counterion source, such as a metal salt, to produce the desired diaryliodonium salt which can be used as a photoinitiator. The iodonium salt photoinitiators made by the method of the present invention can be used to make UV curable compositions.
    Type: Grant
    Filed: December 9, 1976
    Date of Patent: April 24, 1979
    Assignee: General Electric Company
    Inventors: James V. Crivello, Julia H. W. Lam