Patents by Inventor David A. Hammerton

David A. Hammerton 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).

  • Monocarboxylic acid powder coating curing systems
    Patent number: 5393846
    Abstract: A thermosetting powder coating composition having improved optical and weathering properties, such as gloss, orange peel, and Distinctness of Image (DOI), while maintaining other physical properties such as flexibility, durability, solvent and corrosive resistance, which comprises a reactable mixture of a carboxylic acid group-containing polyester, a monocarboxylic acid group-containing material and beta-hydroxyalkylamide curing agent.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: February 28, 1995
    Assignee: Rohm and Haas Company
    Inventors: David A. Hammerton, Karlheinz Kromberger
  • Monocarboxylic acid power coating curing systems
    Patent number: 5266657
    Abstract: A thermosetting powder coating composition having improved optical and weathering properties, such as gloss, orange peel, and Distinctness of Image (DOI), while maintaining other physical properties such as flexibility, durability, solvent and corrosive resistance, which comprises a reactable mixture of a carboxylic acid group-containing polyester, a monocarboxylic acid group-containing material and beta-hydroxyalkylamide curing agent.
    Type: Grant
    Filed: May 29, 1991
    Date of Patent: November 30, 1993
    Assignee: Rohm and Haas Company
    Inventors: David A. Hammerton, Karlheinz Kronberger