Patents by Inventor Cecil V. Stead

Cecil V. Stead 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).

  • Ink-jet ink containing lithium salt of copper complex monoazo dye
    Patent number: 4994111
    Abstract: The dye of the formula: ##STR1## which is suitable for use in aqueous inks, especially for ink jet printing.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: February 19, 1991
    Assignee: Canon Kabushiki Kaisha
    Inventors: Arthur Quayle, Cecil V. Stead
  • Lithium salt of copper complex monoazo dye
    Patent number: 4931550
    Abstract: The dye of the formula: ##STR1## which is suitable for use in aqueous inks, especially for ink jet printing.
    Type: Grant
    Filed: May 5, 1987
    Date of Patent: June 5, 1990
    Assignee: Imperial Chemical Industries PLC
    Inventors: Arthur Quayle, Cecil V. Stead
  • Protein adsorbent including a colored compound containing a quaternary ammonium especially amidinium or guanidimium cationic group and a cellulose reactive group
    Patent number: 4865990
    Abstract: A colored compound containing a cationic group and a cellulose reactive group, especially a compound of the formula:A--Y--B IY'--B IIwhereinA is the cationic group;Y is a chromophore;Y' is a cationic chromophoreandB is the reactive group, which is suitable for the preparation of a protein adsorbent or precipitant for use in the separation of mixtures of proteins.
    Type: Grant
    Filed: July 9, 1987
    Date of Patent: September 12, 1989
    Assignee: Imperial Chemical Industries Plc
    Inventors: Cecil V. Stead, Christopher R. Lowe
  • Anthraquinone derivatives and their use as protein absorbents
    Patent number: 4864018
    Abstract: A compound of the formula: ##STR1## wherein X is a non-chromophoric bridging group which provides at least three single covalent bonds between Ring B and the group R;R is a group containing a reactive halogen atom; andeach A independently is H or an acidic group;provided that the molecule contains sufficient acidic groups to render it water soluble and then when X provides only 3 covalent bonds between Ring B and R, the latter is not a chlorodifuoropyrimidyl group, which is suitable for the preparation of a protein adsorbent or precipitant for use in the separation of mixtures of proteins.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: September 5, 1989
    Assignee: Imperial Chemical Industries PLC
    Inventors: Cecil V. Stead, Steven J. Burton, Christopher R. Lowe
  • Anthraquinone derivatives
    Patent number: 4851528
    Abstract: A water-soluble anthraquinone compound of the formula: ##STR1## wherein A represents a divalent hydrocarbon group;X represents a divalent hydrocarbon group; andR.sup.1 & R.sup.2 each independently is H or alkyl or together, with X and the N atoms to which they are attached, represent a diazaheterocycle;R represents a monovalent hydrocarbon group;n is 0 or 1;Z is H or a group, Y--B;Y is a divalent heterocycle; andB is an activated halogen atom, and an adduct thereof with a carbohydrate substrate, capable of selectively absorbing certain proteinaceous materials and suitable for use in the chromatographic separation of proteins.
    Type: Grant
    Filed: August 27, 1986
    Date of Patent: July 25, 1989
    Assignee: Imperial Chemical Industries PLC
    Inventors: Cecil V. Stead, Steven J. Burton, Christopher R. Lowe
  • Reactive dyestuffs containing chlorine or fluorine substituents and one or more pyridine radicals linked to the dyestuff at the 2-, 4- or 6-position
    Patent number: 4213899
    Abstract: A dyestuff of the formula ##STR1## where D is a chromophoric residuen is 1 or 2Z is ##STR2## where R is H, C.sub.1-4 alkyl, C.sub.1-4 alkyl substituted by OH, OSO.sub.3 H, CN or SO.sub.3 H or is phenyleach hal independently represents a chlorine or fluorine atom occupying one of the remaining 2-, 4- and 6-positions of the pyridine nucleusX is F, Cl, CN or NO.sub.2Y is H, F, Cl, CN or NO.sub.2.These dyestuffs reactively dye cellulose at low temperatures and are less prone to "acid bleeding" than some known reactive dyes.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: July 22, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: Duncan A. S. Phillips, Brian Anderson, Neville Jackson, Cecil V. Stead, Alan T. Costello