Patents by Inventor John D. Symonds

John D. Symonds 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).

  • Antifouling paint comprising a copolymer containing organo tin salt and a pigment having a component which reacts with sea water and another component which does not react with sea water
    Patent number: 4191579
    Abstract: An antifouling paint for ships' hulls, comprising a film-forming copolymer and a pigment component, has the property that a rough film of the paint becomes smoother in relatively moving seawater. The film-forming copolymer contains from more than 50 up to 80 percent by weight of units of at least one triorganotin salt of an olefinically unsaturated carboxylic acid, the balance of the copolymer being units of at least one olefinically unsaturated comonomer. The pigment component comprises a metalliferous pigment capable of reacting with seawater to form a water-soluble metal compound and a pigment which does not react with or dissolve in seawater.
    Type: Grant
    Filed: October 12, 1977
    Date of Patent: March 4, 1980
    Assignee: The International Paint Company Limited
    Inventors: George Hails, John D. Symonds