Patents by Inventor Dwight L. Stephens

Dwight L. Stephens 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).

  • Patent number: 3956215
    Abstract: Water-soluble acidic polyesters are prepared by reacting a hydroxy polycarboxylic acid, such as citric acid, with an alkylene oxide, such as propylene oxide, an alkylene glycol, or styrene oxide and polyesterifying to an acid number of about theoretical to about 25% above theoretical. A thermosetting coating comprises the acidic polyester and a conventional aminoplast in an aqueous vehicle. When the coating is applied to a substrate, such as label stock, and is thermoset, a durable high gloss varnish is produced.
    Type: Grant
    Filed: February 18, 1975
    Date of Patent: May 11, 1976
    Assignee: Mobil Oil Corporation
    Inventors: Richard A. Lamanna, Dwight L. Stephens