Patents by Inventor Paritosh K. Das

Paritosh K. Das 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).

  • Process for sulfur-containing derivatives of hydroxyphenylbenzotriazoles
    Patent number: 5410071
    Abstract: A composition that, when present in a polymer matrix, reduces the deleterious effect of UV light absorption by the polymer is provided, which comprises a sulfur-containing derivative of hydroxyphenylbenzotriazole having the formula of: ##STR1## wherein each X is selected from the group consisting of hydrogen, halogens, cyano, alkyl, phenyl group, biphenyl group, arylthio, amine, ketone, aldehyde, alkoxy, hydroxy, carboxylic acid group, oligomer and combinations thereof and can have carbon atoms up to about 20; n is a whole number from 1 to 5; n' is a whole number from 0 to 4; n" is a whole number from 1 to 2 and each n" can be the same or different; q is an integer from 1 to 10; each Y is selected from the group consisting of --S(O)(O)--, --S(O)--, and --S--; each R can be selected from the group consisting of hydrogen, alkyl group, alkenyl group, aralkyl group, alkaryl group, and combinations thereof and can have 0 to about 10 carbon atoms; each OH group can be at either the 2'- or the 6'-position, or both.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: April 25, 1995
    Assignee: Phillips Petroleum Company
    Inventors: Paul J. DesLauriers, Paritosh K. Das, Darryl R. Fahey
  • Ethylene polymer compositions
    Patent number: 5378747
    Abstract: An ethylene polymer composition is provided that comprises:(a) bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, in an amount that is from about 0.0001 to less than 0.30 weight percent; and(b) at least one color stabilization compound selected from the group consisting of:(1) a carboxylic acid compound;(2) an alcohol compound; and(3) a hydroxycarboxylic acid compound;in an amount from about 0.0001 to about 1 weight percent;wherein said weight percents are based on the weight of said ethylene polymer composition.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: January 3, 1995
    Assignee: Phillips Petroleum Company
    Inventors: Paritosh K. Das, Kenneth W. Willcox
  • Compositions comprising sulfur-containing derivatives of hydroxyphenylbenzotriazole and process therefor
    Patent number: 5274015
    Abstract: A composition that, when present in a polymer matrix, reduces the deleterious effect of UV light absorption by the polymer is provided, which comprises a sulfur-containing derivative of hydroxyphenylbenzotriazole having the formula of: ##STR1## wherein each X is selected from the group consisting of hydrogen, halogens, cyano, alkyl, phenyl group, biphenyl group, arylthio, amine, ketone, aldehyde, alkoxy, hydroxy, carboxylic acid group, oligomer and combinations thereof and can have carbon atoms up to about 20; n is a whole number from 1 to 5; n' is a whole number from 0 to 4; n" is a whole number from 1 to 2 and each n" can be the same or different; q is an integer from 1 to 10; each Y is selected from the group consisting of --S(O)(O)--, --S(O)--, and --S--; each R can be selected from the group consisting of hydrogen, alkyl group, alkenyl group, aralkyl group, alkaryl group, and combinations thereof and can have 0 to about 10 carbon atoms; each OH group can be at either the 2'- or the 6'-position, or both.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: December 28, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Paul J. Deslauriers, Darryl R. Fahey, Paritosh K. Das
  • Compositions comprising sulfur-containing derivatives of hydroxyphenylbenzotriazole and process therefor
    Patent number: 5268450
    Abstract: A composition comprising a stabilizer chemically bonded to a polymer matrix, and which reduces the deleterious effect of UV light absorption by the polymer is provided.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: December 7, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Paul J. DesLauriers, Darryl R. Fahey, Paritosh K. Das