Patents by Inventor Richard G. C. Henbest

Richard G. C. Henbest 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: 4284759
    Abstract: Aminoplast resin pigments for paper making comprise large surface area (>5m.sup.2 /g) particles, preferably of size below 200 .mu.m, made from an aminoplast resin made by condensing formaldehyde with urea and/or melamine in the presence of 0.2 to 15 moles, per 100 moles of formaldehyde, or sulphite, phosphate, phosphite or borate radicals. The resin may be converted to the particulate form by gelling the resin in extended form by dilution with an aqueous acid, followed by drying, curing, and comminution of the gelled resin. To effect gelation in extended form the resin is preferably diluted to a resin solids content of less than 25% by weight by the addition of sufficient acid to cause gelation within 20 minutes.
    Type: Grant
    Filed: May 3, 1979
    Date of Patent: August 18, 1981
    Assignee: Imperial Chemical Industries Limited
    Inventors: Richard G. C. Henbest, John Harrison
  • Patent number: 4268351
    Abstract: A wet laid paper in which at least 1% by weight of the fibrous constituents are UF fibres made from an inorganic oxyacid radical modified UF resin. The inorganic oxyacid radicals are sulphite, phosphate, phosphite, or borate radicals and are present in such an amount that the UF fibres contain 0.2-15 inorganic oxyacid radicals per 100 methylene units. The modified resin is made by reacting urea with formaldehyde in the presence of a source of the oxyacid radicals.
    Type: Grant
    Filed: August 31, 1979
    Date of Patent: May 19, 1981
    Inventors: Richard G. C. Henbest, Kenneth McGregor
  • Patent number: 4202959
    Abstract: The present invention provides fibres of urea formaldehyde, melamine formaldehyde, phenol formaldehyde, and mixtures thereof, modified by inorganic oxyacid radicals derived from inorganic oxyacids of sulphur, salts of such inorganic oxyacids, phosphate radicals, phosphite radicals, borate radicals and mixtures thereof.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: May 13, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: Richard G. C. Henbest, Kenneth McGregor
  • Patent number: 4172057
    Abstract: An amino-resin composition, in particular urea formaldehyde and/or melamine formaldehyde, in the form of fibres, having incorporated therein at least one additional compound which contains at least one aldehyde or ketone group and at least one hydroxyl group bonded to a carbon atom.
    Type: Grant
    Filed: May 2, 1978
    Date of Patent: October 23, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventor: Richard G. C. Henbest