Patents by Inventor Ruth Greenwood

Ruth Greenwood 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).

  • Polymer substrates coated with stabilized polymeric coating composition
    Patent number: 4021405
    Abstract: Articles of manufacture comprising polymeric substrates coated with a composition of matter consisting of an acid catalyzed reaction product of (A) a urethane prepolymer having terminal hydroxy groups produced from (1) a polyol of 200 - 3,000 molecular weight, (2) an organic diisocyanate and (3) a polyhydric alcohol; and (B) a polyalkylether of a polymethylol melamine containing various ultraviolet light absorbers, are disclosed.
    Type: Grant
    Filed: March 20, 1975
    Date of Patent: May 3, 1977
    Assignee: American Cyanamid Company
    Inventors: Robert Jerome Tucker, Ruth Greenwood
  • Coating compositions comprising stabilized reaction product of hydroxyl-terminated urethane and melamine resin
    Patent number: 4017456
    Abstract: Compositions of matter consisting of (A) urethane prepolymers having terminal hydroxy groups produced from (1) a polyol of 200-3,000 molecular weight, (2) an organic polyisocyanate and (3) a polyhydric alcohol which are admixed with (B) a polyalkylether of a polymethylol and (C) an acid catalyst are rendered more adherent to polymeric substrates by incorporating therein various ultraviolet light absorbers.
    Type: Grant
    Filed: March 20, 1975
    Date of Patent: April 12, 1977
    Assignee: American Cyanamid Company
    Inventors: Robert Jerome Tucker, Ruth Greenwood