Patents by Inventor David H. Condlyffe

David H. Condlyffe 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).

  • Wood treatment composition and process
    Patent number: 5094890
    Abstract: Compositions for flame proofing wood e.g. in the form of aqueous solutions containing tetrakis (hydroxymethyl) phosphonium salt, methylolmelamine with at least 3.5 optionally alkylated hydroxymethyl groups per melamine nucleus, a polyfunctional nitrogen compound with at least 2 N-H groups e.g. urea and a base e.g. triethanolamine.
    Type: Grant
    Filed: August 1, 1990
    Date of Patent: March 10, 1992
    Assignee: Albright & Wilson Limited
    Inventors: Kevin M. Smith, David H. Condlyffe