Patents by Inventor David Daffern

David Daffern 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).

  • POLYESTER POLYMER AND POLYESTER-BASED HEAT RESISTANT COATING FOR COOKWARE OR BAKEWARE
    Publication number: 20220389155
    Abstract: A polyester polymer is polymerized from an alcohol component including a diol and a polyol and an acid component including terephthalic acid and isophthalic acid, with the terephthalic acid and isophthalic acid present in a desired molar ratio. The polyester polymer also includes carboxylic acid functional groups, a weight average molecular weight (MW) of at least 5000 Daltons (Da), and an acid value (AV) of 40 to 65. The polyester polymer may be formulated into a water-based coating composition for substrates such as articles of cookware to form a coating that is highly heat resistant and flexible while also providing non-stick properties with good release.
    Type: Application
    Filed: October 23, 2020
    Publication date: December 8, 2022
    Applicant: PPG Industries Ohio, Inc.
    Inventors: Peter R. Jepson, Thomas J. Bate, David Daffern
  • News ink
    Patent number: 4321094
    Abstract: A news ink of low misting properties comprising a dispersion of a news ink pigment in a hydrocarbon oil, wherein the oil has the following physical properties:Color: water whiteAromatic content: zeroRefractive index: 1.467-1.480Specific gravity: 0.850-0.879Viscosity, cSt/40.degree. C.: 9.38-439.7Aniline point, .degree.C.: 96-138.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: March 23, 1982
    Assignee: Canada Printing Ink
    Inventors: Colin B. Batt, David Daffern, Paramanda Gupta