Patents by Inventor Floyd G. Spence

Floyd G. Spence 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).

  • Azo colorants for ball point pen and ribbon inks
    Patent number: 4952677
    Abstract: Reddish-brown to yellow shade colorants suitable for ribbon and ball point inks are produced from the glassy waste by-product of pararosaniline manufacture by slurrying the residue in mineral acid, diazotizing, and coupling. the resulting colorants are useful in preparing inks.
    Type: Grant
    Filed: September 15, 1988
    Date of Patent: August 28, 1990
    Assignee: BASF Corporation
    Inventors: Floyd G. Spence, Louis R. de Alvare, Robert J. Allen
  • Rigmentary salt of a triphenylmethane compound and process for making same
    Patent number: 4944806
    Abstract: Pigmentary Opal Sulfate is made by combining triphenylpararosaniline (Opal Blue) with a dilute acid. The pigmentary Opal Sulfate is a substitute for Alkali Blue. The most preferred process for producing the pigmentary Opal Sulfate involves drowning a solution of Opal Blue in a highly agitated solution of dilute sulfuric acid.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: July 31, 1990
    Assignee: BASF Corporation
    Inventors: Anand S. G. Sharangpani, Floyd G. Spence, Brian D. Teunis
  • Process for the synthesis of 3-chloro-2,4,5-trifluorobenzoic acid
    Patent number: 4885386
    Abstract: An improved process for the preparation of 3-chloro-2,4,5-trifluorobenzoic acid is described which involves reaction of a diester of 3,4,5,6-tetrafluoro-1,2-benzenedicarboxylic acid with a substituted amine to afford 3-amino-2,4,5-trifluorobenzoic acid followed by subsequent conversion of the amio intermediate into 3-chloro-2,4,5-trifluorobenzoic acid.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: December 5, 1989
    Assignee: Warner-Lambert Company
    Inventors: James N. Wemple, Gregory L. Karrick, Floyd G. Spence
  • Colorants for ball-point pen and ribbon inks
    Patent number: 4824610
    Abstract: Substantially pure triarylmethane dyestuff salts free of contamination by arylamines are prepared by isolating in relatively pure form, the carbinol base corresponding to the dyestuff followed by salt formation by reaction with the appropriate acid. The resulting colorants are highly suitable for ball-point pen, printing, and ribbon inks.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: April 25, 1989
    Assignee: BASF Corporation
    Inventors: Reinhard J. Sappok, Louis R. de Alvare, Floyd G. Spence
  • Colorants for ball point pen and ribbon inks derived from pararosaniline process residue
    Patent number: 4800043
    Abstract: Reddish-brown to yellow shade colorants suitable for ribbon and ball point inks are produced from the glassy waste by-product of pararosaniline manufacture.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: January 24, 1989
    Assignee: BASF Corporation
    Inventors: Robert J. Allen, Louis Rolando de Alvare, Floyd G. Spence
  • Solvent extraction of nitrated organic compounds from aqueous solutions
    Patent number: 4426291
    Abstract: This invention relates to a process for the separation of a nitrated substance from a spent nitrating acid wherein said nitrated substance contains polar groups selected from the group consisting of --SO.sub.3 H, --OH, --SH --CO.sub.2 H, --OSO.sub.3 H, and --OP(OH).sub.2 and their salts. This is achieved by:(1) diluting the nitrated substance-spent acid solution with water,(2) adding a monohydric alcohol or ketone extraction agent which is immiscible with the spent acid,(3) permitting the mixture to separate into layers of different densities one of said layers comprising said nitrated substance dissolved in said extracting agent,(4) removing said nitrated substance-extracting agent layer,(5) separating the nitrated substance from the extracting agent layer, and(6) reducing the nitrated substance to an amine.
    Type: Grant
    Filed: November 23, 1981
    Date of Patent: January 17, 1984
    Assignee: BASF Wyandotte Corporation
    Inventors: Shrikishna G. Sharangpani, Floyd G. Spence