Patents by Inventor Alistair B. Boyd

Alistair B. Boyd 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: 5102466
    Abstract: The present invention provides a process for the production of a metallized azo pigment having the formula ##STR1## in which R and R.sub.1, independently, are hydrogen, halogen or alkyl; X.sub.1 is SO.sub.3.sup..crclbar. or CO.sub.2.sup..crclbar. ; and M is Ca, Sr, Mn or Ba; comprising coupling, at a pH value below 7.0, a diazotized amine of formula ##STR2## in which R, R.sub.1 and X.sub.1 have their previous significance, with a coupling component of formula ##STR3## to produce an azo dyestuff having the formula ##STR4## in which R, R.sub.1 and X.sub.1 have their previous significance, and Y is an alkaline earth metal or ammonium ion; and laking the dyestuff of formula IV during or after its production with one or more salts of a metal M wherein M has its previous significance.Also disclosed is a new modification of a pigment of formula I.
    Type: Grant
    Filed: February 21, 1991
    Date of Patent: April 7, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Michael Mordente, Alistair B. Boyd
  • Patent number: 4188236
    Abstract: A process for the production of a non-dusting pigment composition by contacting an aqueous dispersion of an organic pigment with(a) a solution or dispersion of an alkaline soluble rosin acid derivative(b) a sorbitan ester, and(c) a water-insoluble organic carrier having a melting point below 100.degree. C. at a temperature above the melting point of both the sorbitan ester and the organic carrier, reducing the pH to below .epsilon., stirring the composition until the pigment, rosin derivative, sorbitan ester and organic carrier are associated in generally spherical granules and recovering the resulting granules.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: February 12, 1980
    Assignee: Ciba-Geigy Corporation
    Inventors: George H. Robertson, Alistair B. Boyd, Robert L. Rooney