Patents by Inventor Taher Iqbal Yousaf

Taher Iqbal Yousaf 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: 6869453
    Abstract: A reactive dye compound comprising: (a) at least one chromophore moiety; (b) at least one nitrogen-containing heterocycle; (c) a linking group to link each chromophore moiety to each nitrogen-containing heterocycle; characterised in that at least one nitrogen-containing heterocycle is substituted with at least one Y group wherein Y is a phosphonate or a borate derivative. The compounds herein have high Exhaustion Values (E), high Fixation Values (F) and high Efficiency Values (T) and show significant improvements in terms of reducing spent dyestuff in effluent, increasing dye affinity to the substrate, increasing the dye-substrate covalent bonding, increasing the ability to dye substrates at room temperature, decreasing the amount of dye that is removed during the post dyeing “soaping off process” and therefore simplifying the post dyeing “soaping off process” traditionally associated with dyeing cotton with fibre reactive dyes and reduction of staining of adjacent white fabrics.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: March 22, 2005
    Assignee: North Carolina State University
    Inventors: David Malcolm Lewis, Dong Wei He, Taher Iqbal Yousaf, Gilles Yves Marie Fernand Genain
  • Patent number: 6790943
    Abstract: A reactive dye compound comprising: (a) at least one chromophore moiety; (b) at least one SO2C2H4 group which is attached to the chromophore moiety either directly via the sulphur atom of the SO2C2H4 group or via a linking group L; characterized in that at least one SO2C2H4 group is substituted on its terminal carbon atom with at least one Y group wherein Y is derived from a hydrated aldehyde, a hydrated ketone, a hydrated alpha-hydroxy ketone or the hydrated form of formic acid, and linked via one of its oxygen atoms to the terminal carbon of the SO2C2H4 group thereby forming a hemiacetal.
    Type: Grant
    Filed: March 27, 2002
    Date of Patent: September 14, 2004
    Assignee: North Carolina State University
    Inventors: Peter Jeffrey Broadbent, David Malcolm Lewis, Gilles Yves Marie Fernand Genain, Wei Dong He, Taher Iqbal Yousaf
  • Patent number: 6736864
    Abstract: A reactive dye compound comprising: (a) at least one chromophore moiety; (b) at least one SO2C2H4 group which is attached to the chromphore moiety either directly via the sulphur atom of the SO2C2H4 group or via a linking group L; characterized in that at least one SO2C2H4 group is substituted on its terminal carbon atom with at least one Y group wherein Y is a phosphonate or borate derivative.
    Type: Grant
    Filed: March 27, 2002
    Date of Patent: May 18, 2004
    Assignee: North Carolina State University
    Inventors: David Malcolm Lewis, Dong Wei He, Taher Iqbal Yousaf, Gilles Yves Marie Fernand Genain
  • Patent number: 6723834
    Abstract: A reactive dye compound comprising: (a) at least one chromophore moiety; (b) at least one nitrogen-containing heterocycle (c) a linking group to link each chromophore moiety to each nitrogen-containing heterocycle; characterized in that at least one nitrogen-containing heterocycle is substituted with at least one Y group wherein Y is derived from a hydrated aldehyde, a hydrated ketone, a hydrated alpha-hydroxy ketone, or the hydrated form of formic acid and linked via one of its oxygen atoms to the nitrogen-containing heterocycle thereby forming a hemiacetal.
    Type: Grant
    Filed: March 27, 2002
    Date of Patent: April 20, 2004
    Assignee: North Carolina State University
    Inventors: Peter Jeffrey Broadbent, Dong Wei He, David Malcolm Lewis, Gilles Yves Marie Fernand Ganain, Taher Iqbal Yousaf
  • Patent number: 6716969
    Abstract: A reactive dye compound comprising: (a) at least one chromophore moiety (b) at last one SO2C2H4 group which is attached to the chromophore moiety either direcly via the sulphur atom of the SO2C2H4 group or a linking group L; characterized in that at least one SO2C2H4 group is substituted on its terminal carbon atom with at least one Y group wherein Y is —A(CO)R* wherein A is selected from O or S and wherin R′ contains at least one terminal nucleophilic group, such as OH, NH2, SH, COOH, N, NHR1 and NR1R2 wherein R1 and R2 may be the same of different and may be selected from C1-C4 alkyl; and salts therof. Also claimed is a process of manufacture of the compounds herein and products obtainable by the process.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: April 6, 2004
    Assignee: North Carolina State University
    Inventors: David Malcolm Lewis, Wei Dong He, Taher Iqbal Yousaf, Gilles Yves Maria Fernand Genain
  • Patent number: 6713613
    Abstract: A reactive dye compound comprising: (a) at least one chromophore moiety (b) at least one nitrogen-containing heterocycle (c) a linking group to link each chromophore moiety to each nitrogen-containing heterocycle; characterised in that at least one nitrogen-containing heterocycle is substituted with at least one oxy- or thio-carbonyl derivative wherein the oxy- or thio-carbonyl derivative is selected from Y wherein Y is —A(CO)R* wherein A is selected from O or S and wherein R* is an organic residue which comprises at least one nucleophilic group, and salts thereof.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: March 30, 2004
    Assignee: North Carolina State University
    Inventors: David Malcolm Lewis, Wei Dong He, Taher Iqbal Yousaf, Gilles Yves Marie Fernand Genain
  • Patent number: 6518407
    Abstract: A novel reactive dye compound is disclosed. It comprises (a) at least one chromophore moiety; (b) at least one nitrogen-containing heterocycle; (c) a linking group to link each chromophore moiety to each nitrogen-containing heterocycle; characterised in that at least one nitrogen-containing heterocycle is substituted with at least one thio-derivative and at least one quaternized nitrogen derivative.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: February 11, 2003
    Assignee: The Procter & Gamble Company
    Inventors: Earl David Brock, David Malcolm Lewis, Taher Iqbal Yousaf
  • Patent number: 6447554
    Abstract: This invention relates to reactive dye compounds, and more especially to reactive dye compounds comprising a chromophore and a nitroen-containing heterocycle comprising at least one thio-substituent. The reactive dye compounds of the present are particularly suitable for dyeing hair.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: September 10, 2002
    Assignee: The Procter & Gamble Company
    Inventors: Earl David Brock, David Malcolm Lewis, Taher Iqbal Yousaf
  • Patent number: 6398822
    Abstract: Packaged hair coloring composition comprising a stable aqueous hair coloring composition comprising a compound of formula (I): wherein the variables are each as defined in the claims. The packaged hair coloring compositions of the present invention provide improved wash fastness of dye on hair, less color fade over time, improved consumer acceptance in terms of providing a single packaged hair dye composition and improved product stability.
    Type: Grant
    Filed: December 18, 2000
    Date of Patent: June 4, 2002
    Assignee: The Proctor & Gamble Company
    Inventors: Earl David Brock, Heather Holden Harper, Taher Iqbal Yousaf
  • Patent number: 6350862
    Abstract: Reactive Dye compound having formula (I) wherein: D is a chromophore group; L is a linking moiety; Q is a quaternized nitrogen derivative; X and Y are independently selected from chlorine, bromine, fluorine or hydrogen; A is selected from halogen, preferably chlorine or fluorine; provided that at least one of X and Y is fluorine; A is selected from halogen, preferably chlorine or fluorine; and salts and esters thereof.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: February 26, 2002
    Assignee: The Procter & Gamble Company
    Inventors: Earl David Brock, David Malcolm Lewis, Taher Iqbal Yousaf
  • Patent number: 5929012
    Abstract: A process for pretreating soiled fabrics prior to washing with a liquid composition comprising a peroxygen bleach, a nonionic surfactant, an anionic surfactant and a compound chelating copper and/or iron and/or manganese is provided. The liquid composition used in such process is also provided.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: July 27, 1999
    Assignee: Procter & Gamble Company
    Inventors: Valerio Del Duca, John Scott Park, Dario Rapisarda, Barry Stoddart, Marina Trani, Taher Iqbal Yousaf