Patents by Inventor Paul S. L. Chan

Paul S. L. Chan 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).

  • Foundry mixes and their uses
    Patent number: 5459178
    Abstract: This invention relates to foundry mixes and their uses. The foundry mixes comprise (a) a foundry aggregate, and (b) a foundry binder comprising in admixture; (1) an acetoacetate ester; (2) an .alpha., .beta. ethylenically unsaturated monomer; and (3) a liquid tertiary amine catalyst having a pK value of 12-14. The foundry mixes are used to prepare foundry shapes made from foundry mixes by a no-bake process.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: October 17, 1995
    Assignee: Ashland Inc.
    Inventors: Paul S. L. Chan, Satish S. Jhaveri, W. Graham Carpenter
  • NCO-free resins useful as a substitute for polyurethanes
    Patent number: 5132367
    Abstract: Compositions obtained by curing an acetoacetylated poly(meth)acrylic or polyester-based resin and a NCO-free urethane polymer having vinylic end groups is disclosed.
    Type: Grant
    Filed: August 19, 1991
    Date of Patent: July 21, 1992
    Assignee: Guertin Bros. Coatings and Sealants Ltd.
    Inventor: Paul S. L. Chan