Patents by Inventor Dean A. Schreffler

Dean A. Schreffler 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).

  • Powder coating with non-crystalline and crystalline epoxy resins and curing agent
    Patent number: 6616979
    Abstract: Provided are low temperature curing thermosetting epoxy powder coating compositions comprising at least one non-crystalline epoxy resin, at least one crystalline epoxy resin, a curing agent, and a cure catalyst. Coatings made from such powder compositions exhibit a substantial reduction in bubble entrapment, enough to prevent a visible haze from forming in the coating, when cured at low temperatures demanded by brass substrates.
    Type: Grant
    Filed: August 13, 2001
    Date of Patent: September 9, 2003
    Assignee: Rohm and Haas Company
    Inventors: William G. Ruth, Stacy L. Greth, Carryll A. Seelig, Dean A. Schreffler
  • Thermosetting epoxy powder coatings having improved degassing properties
    Publication number: 20020019499
    Abstract: Provided are low temperature curing thermosetting epoxy powder coating compositions comprising at least one non-crystalline epoxy resin, at least one crystalline epoxy resin, a curing agent, and a cure catalyst. Coatings made from such powder compositions exhibit a substantial reduction in bubble entrapment, enough to prevent a visible haze from forming in the coating, when cured at low temperatures demanded by brass substrates, while the powders from which the coatings are made still exhibit good storage stability and melt-processability.
    Type: Application
    Filed: August 13, 2001
    Publication date: February 14, 2002
    Inventors: William G. Ruth, Stacy L. Greth, Carryll A. Seelig, Dean A. Schreffler
  • Substrate coated with powdered non-crystalline and crystalline epoxy resins
    Patent number: 6309751
    Abstract: To a substrate such as brass is applied a powder coating comprising a) at least one non-crystalline epoxy resin, b) at least one crystalline epoxy resin such as tetramethylbisphenol diglycidyl ether in an amount sufficient to reduce or eliminate bubble entrapment within the cured coating when cured at a temperature of below about 350° F. (about 177° C.), and c) a curing agent such as dicyandiamide.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: October 30, 2001
    Assignee: Rohm and Haas Company
    Inventors: William G. Ruth, Stacy L. Greth, Carryll A. Seelig, Dean A. Schreffler
  • Powder coating of non-crystalline and crystalline epoxy resins
    Patent number: 6140430
    Abstract: Provided are low temperature curing thermosetting epoxy powder coating compositions comprising at least one non-crystalline epoxy resin, at least one crystalline epoxy resin, a curing agent, and a cure catalyst. Coatings made from such powder compositions exhibit a substantial reduction in bubble entrapment, enough to prevent a visible haze from forming in the coating, when cured at low temperatures demanded by brass substrates, while the powders from which the coatings are made still exhibit good storage stability and melt-processability.
    Type: Grant
    Filed: May 7, 1999
    Date of Patent: October 31, 2000
    Assignee: Morton International Inc.
    Inventors: William G. Ruth, Stacy L. Greth, Carryll A. Seelig, Dean A. Schreffler
  • Textured epoxy powder coating
    Patent number: 5212263
    Abstract: A powder coating composition forming a textured finish comprises epoxy resin, methylene disalicylic acid and an imidazole Bisphenol A epoxy resin.
    Type: Grant
    Filed: January 10, 1991
    Date of Patent: May 18, 1993
    Assignee: Morton International, Inc.
    Inventor: Dean A. Schreffler
  • Epoxy coating powders with wrinkle finishes
    Patent number: 4341819
    Abstract: An epoxy coating powder applied in a fusion coating process that yields a low gloss, wrinkled finish. The coating composition is a heat reactive epoxy resin in which the wrinkled finish results from the use of methylene disalicylic acid as the curing agent for the epoxy resin.
    Type: Grant
    Filed: December 29, 1980
    Date of Patent: July 27, 1982
    Assignee: The Polymer Corporation
    Inventors: Dean A. Schreffler, Charles M. Noonan