Patents by Inventor Kuo Y. Chang

Kuo Y. Chang 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).

  • Cleavage of polyethylene glycol ethers by hydrolysis
    Patent number: 4806658
    Abstract: High molecular weight polyethylene glycol monoethers are cleaved to prepare lower oligomeric reaction products by contacting a mixture of the high molecular weight polyethylene glycol monoether and water with a hydrolytic cleavage catalyst such as alumina at elevated temperatures.
    Type: Grant
    Filed: November 15, 1982
    Date of Patent: February 21, 1989
    Assignee: The Dow Chemical Company
    Inventors: Kuo Y. Chang, Iwao Kohatsu, Philip E. Garrou
  • .beta.-isocyanato organosilanes
    Patent number: 4736046
    Abstract: Novel .beta.-isocyanatoethoxy silanes and a method for their preparation is provided in which a 2-oxazolidinone is reacted with a halosilane to form a novel intermediate silyl-2-oxazolidinone product. The intermediate is then exposed to heat under reduced pressure to convert it to a .beta.-isocyanatoethoxy silane. The difunctional monomeric products are useful as starting materials for a variety of silicone and polyurethane prepolymers and polymers.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: April 5, 1988
    Assignee: The Dow Chemical Company
    Inventor: Kuo Y. Chang
  • Preparation of trisphenol methanes
    Patent number: 4695408
    Abstract: Prepare tris(p-hydroxy-disubstituted phenyl) methanes from 2,6-disubstituted phenols and salicylaldehyde.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: September 22, 1987
    Assignee: The Dow Chemical Company
    Inventor: Kuo Y. Chang
  • Process for the preparation of bis(1-phenylethenyl) compounds
    Patent number: 4365103
    Abstract: A 1,1-diphenylethane and an aromatic compound such as benzene are reacted in the presence of a Friedel-Craft's catalyst to provide a compound having two 1,1-diaromatic substituted ethane groups, dehydrogenation provides a bis(1-phenylethenyl)aromatic compound.
    Type: Grant
    Filed: December 4, 1981
    Date of Patent: December 21, 1982
    Assignee: The Dow Chemical Company
    Inventors: Kuo Y. Chang, Sterling C. Gatling