Patents by Inventor Peter Sinclair

Peter Sinclair 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).

  • Process for the production of microcapsules
    Patent number: 4396670
    Abstract: In a process for the production of microcapsules containing a liquid fill material, a dispersion-stabilizing species is produced in an aqueous acidic medium by interaction of a melamine formaldehyde precondensate and a water soluble polymer, neither of which alone is dispersion stabilizing with respect to the liquid fill material, and the precondensate is condensed by acid catalysis to produce a condensate which separates from solution and enwraps the liquid fill material to produce microcapsules.
    Type: Grant
    Filed: March 24, 1981
    Date of Patent: August 2, 1983
    Assignee: The Wiggins Teape Group Limited
    Inventor: Peter Sinclair
  • Process of recovering fibres
    Patent number: 4264412
    Abstract: Fibre recovery process for pressure-sensitive carbonless copying paper which comprises defibrating the wastage in aqueous media, preferably in the presence of a cationic quaternary ammonium surface active agent, treating the wastage with acid to destroy the microcapsules, and bleaching the defibrated wastage with a bleaching agent.
    Type: Grant
    Filed: May 22, 1979
    Date of Patent: April 28, 1981
    Assignee: The Wiggins Teape Group Limited
    Inventors: David J. Hasler, Peter Sinclair, Eileen H. Burns