Patents by Inventor Robin G. Booth

Robin G. Booth 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).

  • Efficiency of ultrafiltration purification of solutions of polymeric colorants by inorganic base addition
    Patent number: 4225432
    Abstract: The ultrafiltration purification of aqueous solutions of polymeric colorants, wherein low molecular weight impurities are removed in an ultrafiltrate leaving a purified polymeric colorant-bearing retentate, is carried out with improved efficiency when during at least 2 diavolumes of ultrafiltration, the pH of the retentate is maintained above about pH 9.0.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: September 30, 1980
    Assignee: Dynapol
    Inventors: Robin G. Booth, Anthony R. Cooper
  • Salt addition in ultrafiltration purification of solutions of polymeric colorants
    Patent number: 4189380
    Abstract: The ultrafiltration purification of aqueous solutions of polymeric colorants, wherein low molecular weight impurities are removed in an ultrafiltrate leaving a purified polymeric colorant-bearing retentate, is carried out with improved efficiency when, during at least two diavolumes of ultrafiltration, the salt content of the retentate is maintained above about 1% by weight.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: February 19, 1980
    Assignee: Dynapol
    Inventors: Robin G. Booth, Anthony R. Cooper
  • Ultrafiltration purification of solution of polymeric anthraquinone colorants
    Patent number: 4088572
    Abstract: The ultrafiltration purification of aqueous solutions of polymeric anthraquinone colorants, wherein low molecular weight impurities are removed in an ultrafiltrate leaving a purified anthraquinone colorant-bearing retentate, is carried out with improved efficiency when pyridine is present and maintained in the aqueous solutions at a level of from 1 to 20% by volume.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: May 9, 1978
    Assignee: Dynapol
    Inventors: Anthony R. Cooper, Robin G. Booth, David P. Matzinger