Patents by Inventor Joseph Varapadavil Kurian

Joseph Varapadavil Kurian 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).

  • Treated poly(trimethylene terephthalate) carpets
    Patent number: 6777059
    Abstract: A treated poly(trimethylene terephthalate) carpet prepared by applying a polyfluoroacrylate emulsion to a poly(trimethylene terephthalate) carpet and curing the polyfluoroacrylate.
    Type: Grant
    Filed: June 18, 2002
    Date of Patent: August 17, 2004
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Joseph Varapadavil Kurian, Justine Gabrielle Franchina
  • Treated poly(trimethylene terephthalate) carpets
    Publication number: 20030175476
    Abstract: A treated poly(trimethylene terephthalate) carpet prepared by applying a polyfluoroacrylate emulsion to a poly(trimethylene terephthalate) carpet and curing the polyfluoroacrylate.
    Type: Application
    Filed: June 18, 2002
    Publication date: September 18, 2003
    Inventors: Joseph Varapadavil Kurian, Justine Gabrielle Franchina
  • Poly(trimethylene terephthalate) carpets
    Publication number: 20030175522
    Abstract: A treated poly(trimethylene terephthalate) carpet prepared by a process comprising applying a fluoropolymer emulsion to a poly(trimethylene terephthalate) carpet and curing the fluoropolymer at a temperature of about 250 to about 310° F., the treated poly(trimethylene terephthalate) carpet having an oil repellency rating of at least 4. In addition, a process of preparing the treated poly(trimethylene terephthalate) carpet.
    Type: Application
    Filed: March 13, 2002
    Publication date: September 18, 2003
    Inventors: Joseph Varapadavil Kurian, Justine Gabrielle Franchina
  • Poly(trimethylene terephthalate) with low level of DI(1,3-propylene glycol)
    Publication number: 20020123606
    Abstract: A process of preparing poly(trimethylene terephthalate) containing less than 2.
    Type: Application
    Filed: November 20, 2001
    Publication date: September 5, 2002
    Inventors: Joseph Varapadavil Kurian, Yuanfeng Liang
  • Transesterification process using yttrium and samarium compound catalystis
    Patent number: 6350895
    Abstract: This invention relates to an improvement for the preparation of bis(3-hydroxypropyl) dicarboxylate monomers using 1,3-propanediol and a dialkyl dicarboxylate in the presence of a catalytic amount of such yttrium and/or samarium compounds as yttrium/samarium acetylacetonate or tris(2,2,6,6-tetramethyl-3,5-heptanedionato) yttrium/samarium which act as a catalyst for the transesterification reaction
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: February 26, 2002
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Joseph Varapadavil Kurian
  • Preparation of poly(trimethylene terephthalate) with low level of di(1,3-propylene glycol)
    Patent number: 6335421
    Abstract: A process of preparing poly(trimethylene terephthalate) containing less than 2.0 mole % of DPG comprising: (a) providing a molar amount of 1,3-propanediol:C1 to C4 dialkyl ester of terephthalic acid of 1.2:1 to 1.9:1, (b) reacting the 1,3-propanediol with the C1 to C4 dialkyl ester of terephthalic, acid to form bis(3-hydroxypropyl)terephthalate monomer in the presence of 10-100 ppm (as titanium metal) of an organic titanate catalyst, by weight of the poly(trimethylene terephthalate), and (c) polymerizing the bis(3-hydroxypropyl)terephthalate monomer to obtain the poly(trimethylene terephthalate); and poly(trimethylene terephthalate) produced by the process.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: January 1, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Joseph Varapadavil Kurian, Yuanfeng Liang
  • Low emission polymer compositions
    Patent number: 6331264
    Abstract: The invention comprises polymer compositions containing 3-hydroxypropanoxy terminated polymer that exhibit reduced levels of degradation product emissions during processing, by contacting the polymer in the molten state with a melt stable, organic nitrogen-containing stabilizing compound, such as polyamide.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: December 18, 2001
    Assignee: E. I. Du Pont De Nemours and Company
    Inventors: Joseph Varapadavil Kurian, Jing Chung Chang
  • Process of making a polyester or polyol
    Patent number: 6325945
    Abstract: This invention relates to an improved process for the treatment of aqueous waste stream containing aldehydes and ketones, in particular, alpha, beta-ethylenically unsaturated aldehydes and ketones, which can be rendered non-toxic to biological treatment systems by contacting the waste stream with organic polyamines and/or inorganic ammonium compounds at essentially ambient conditions.
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: December 4, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Joseph Varapadavil Kurian, Yuan Feng Liang
  • Preparation of poly(trimethylene terephthalate)
    Patent number: 6281325
    Abstract: In one embodiment, the invention is a process for the preparation of poly(trimethylene terephthalate) comprising (a) contacting terephthalic acid with 1,3-propanediol in the presence of an organic tin catalyst to form a bis(3-hydroxypropyl)terephthalate monomer; and (b) polymerizing said monomer in the presence of organic titanate polycondensation catalyst to obtain the poly(trimethylene terephthalate). In another embodiment, the invention is a process for the preparation of poly(trimethylene terephthalate) containing less than 1.6 mol % of DPG said process comprising contacting terephthalic acid with a 1.6 to 1 to 2:1 molar amount of 1,3-propanediol in the presence of 20 to 120 ppm (as tin), by weight of the poly(trimethylene terephthalate), of a organic tin catalyst, to form a bis(3-hydroxypropyl)terephthalate monomer and polymerizing said monomer to obtain the poly(trimethylene terephthalate). The invention is also directed to poly(trimethylene terephthalate) produced by the processes.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: August 28, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Joseph Varapadavil Kurian, Yuanfeng Liang
  • Treatment of aqueous aldehyde waste streams
    Patent number: 6277289
    Abstract: This invention relates to an improved process for the treatment of aqueous waste stream containing aldehydes and/or ketones, in particular, alpha, beta-ethylenically unsaturated aldehydes and ketones, which can be rendered non-toxic to biological treatment systems by contacting the waste stream with organic polyamines and/or inorganic ammonium compounds at essentially ambient conditions.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: August 21, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Joseph Varapadavil Kurian, Yuan Feng Liang
  • Nucleating agent for polyesters
    Patent number: 6245844
    Abstract: Disclosed are polyester polymer compositions containing sodium additives as nucleating agents. More specifically disclosed is the use of mono-sodium salts of dicarboxylic acids as nucleating agents.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: June 12, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Joseph Varapadavil Kurian, Yuan Feng Liang
  • Transesterification process using lanthanum compound catalyst
    Patent number: 5840957
    Abstract: This invention relates to an improved transesterification process for the preparation of bis(3-hydroxypropyl) terephthalate monomer from 1,3-propanediol and a dialkyl terephthalate using a lanthanum compound transesterification catalyst.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: November 24, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Joseph Varapadavil Kurian, Yuanfeng Liang