Patents Represented by Attorney John A. Langworthy

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  • Method and apparatus for reducing a nitrogen oxide, and control thereof
    Patent number: 7575931
    Abstract: Disclosed herein is a method and apparatus for reducing a nitrogen oxide, and the control thereof.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: August 18, 2009
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: John Carl Steichen, Patricia A. Morris, John James Barnes
  • Process for the synthesis of 2,5-Dihydroxyterephthalic acid
    Patent number: 7576237
    Abstract: 2,5-dihydroxyterephthalic acid is produced in high yields and high purity from 2,5-dihaloterephthalic acid by contact with a copper source and a ligand that coordinates to copper under basic conditions.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: August 18, 2009
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Joaquim C. Ritter
  • Multidentate phosphite ligands, catalytic compositions containing such ligands, and catalytic processes utilizing such catalytic compositions
    Patent number: 6812352
    Abstract: Multidentate phosphite ligands are disclosed for use in reactions such as hydrocyanation and isomerization. The catalyst compositions made therefrom and the various catalytic processes which employ such multidentate phosphite ligands are also disclosed. In particular, the ligands have heteroatom-containing substituents on the carbon attached to the ortho position of the terminal phenol group.
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: November 2, 2004
    Assignee: Invista North America S.a.r.l.
    Inventors: Kristina Ann Kreutzer, Wilson Tam, J. Michael Garner, John Ronald Boyles
  • Triazole linked carbohydrates
    Patent number: 6664399
    Abstract: Disclosed is an invention concerning triazolyloligosaccharides, oligosaccharides wherein the bonding between the saccharide groups is via a triazole group and methods for their preparation.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: December 16, 2003
    Assignee: E. I. du Pont de Nemours & Company
    Inventor: Subramaniam Sabesan
  • Preparation of a 2,3-dihaloperfluorocarbonyl halide
    Patent number: 5557010
    Abstract: Process for preparing a 2,3-dihaloperfluoropropionyl halide wherein an alkali metal chloride, bromide or iodide is contacted with a 3-haloperfluoropropene oxide in admixture in an inert liquid reaction medium.
    Type: Grant
    Filed: June 25, 1992
    Date of Patent: September 17, 1996
    Assignee: The Dow Chemical Company
    Inventors: Kevin P. Darst, Bobby R. Ezzell, Nobuyuki Ishibe
  • Process for preparation of haloginated esters
    Patent number: 5235094
    Abstract: A halogenated ester is prepared by addition of a halogenated nucleophile to a diester at a temperature less than 15.degree. C. but greater than -25.degree. C.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: August 10, 1993
    Assignee: The Dow Chemical Company
    Inventors: Kevin P. Darst, Marius W. Sorenson
  • Process for preparing halogenated polycarbonate from emulsified reaction mixture
    Patent number: 5218078
    Abstract: A process for preparing a halogenated polycarbonate wherein phenolic-terminated, halogenated carbonate oligomers are prepared in the presence of a coupling catalyst, and are then condensed by contact with a carbonate precursor.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: June 8, 1993
    Assignee: The Dow Chemical Company
    Inventors: Maurice J. Marks, John K. Sekinger
  • Process for preparing random copolycarbonate from dianion of ortho-substituted dihydric phenol
    Patent number: 5212282
    Abstract: A process for preparation of a random copolycarbonate from an ortho-substituted dihydric phenol and a non-ortho-substituted dihydric phenol.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: May 18, 1993
    Assignee: The Dow Chemical Company
    Inventors: Maurice J. Marks, Thoi H. Ho
  • Process for the preparation of high molecular weight halogenated polycarbonate
    Patent number: 5212281
    Abstract: A process for preparing halogenated polycarbonate wherein the total amount of base, the end pH of the aqueous phase, and the amount of coupling catalyst employed in the reaction are controlled to selected levels.
    Type: Grant
    Filed: August 8, 1991
    Date of Patent: May 18, 1993
    Assignee: The Dow Chemical Company
    Inventors: Sarat Munjal, Clark J. Cummings, Che-I Kao
  • Process for preparation of fluorinated carbonyl compounds
    Patent number: 5206422
    Abstract: A process for the preparation of fluorinated carbonyl compounds from a fluorinated methyl or ethyl ether using tin tetrachloride as a catalyst. The fluorinated ether is contacted with the tin tetrachloride catalyst at a temperature between 0.degree. C. and 250.degree. C.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: April 27, 1993
    Assignee: The Dow Chemical Company
    Inventor: David A. Babb
  • Process for preparing polycarbonate having reduced carbonate byproduct content
    Patent number: 5200496
    Abstract: A process for preparing polycarbonate wherein a chain terminator is added to the reaction mixture after substantial reaction of a carbonate precursor, a coupling catalyst is added to the reaction mixture after substantial reaction of the chain terminator, and base is added to the reaction mixture after reaction mixture after substantial reaction of the chain terminator in an amount sufficient to give a negative chloroformate test.
    Type: Grant
    Filed: July 2, 1991
    Date of Patent: April 6, 1993
    Assignee: The Dow Chemical Company
    Inventors: Sarat Munjal, Thomas M. Wardlow, Andrew F. Hall
  • Impact resistant blends of high heat polycarbonate and aromatic polyester
    Patent number: 5196479
    Abstract: A composition possessing a desirably high balance of resistance to thermal deformation and to chemical solvents, and reduced notch sensitivity, prepared from a polycarbonate having a glass transition temperature in excess of at least 165.degree. C., an aromatic polyester, a polyphenylene ether, and an elastomeric impact modifier.
    Type: Grant
    Filed: February 27, 1991
    Date of Patent: March 23, 1993
    Assignee: The Dow Chemical Company
    Inventors: Michael K. Laughner, Hani Farah
  • Uniform distribution polycarbonate pellet
    Patent number: 5187256
    Abstract: A polycarbonate pellet having a size between 200 and 1,500 microns, not inclusive, is produced by extruding molten polycarbonate through a die and cutting such extrudate with a die face cutter.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: February 16, 1993
    Assignee: The Dow Chemical Company
    Inventor: Richard O. Kirk
  • Thermoplastic molding compositions with improved solvent resistance and impact strength, and methods for preparation thereof
    Patent number: 5124402
    Abstract: Thermoplastic molding composition containing a polycarbonate, a polyester, an olefin/carbon monoxide copolymer, a mono-alkenyl aromatic/diene block copolymer and a grafted core-shell elastomer.
    Type: Grant
    Filed: August 21, 1990
    Date of Patent: June 23, 1992
    Assignee: The Dow Chemical Company
    Inventors: Michael K. Laughner, Brenda N. Herron, Clive P. Bosnyak
  • Blow molding of thermoplastic polymeric compositions containing a fluorinated olefin
    Patent number: 5094806
    Abstract: A process of blow molding, and compositions useful in the process. The articles are blow molded from compositions formed from thermoplastic polymeric material, a fluorinated olefinic polymer or copolymer and, optionally, an elastomeric impact modifier.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: March 10, 1992
    Assignee: The Dow Chemical Company
    Inventor: Michael K. Laughner
  • Filled thermoplastic molding compositions
    Patent number: 5082890
    Abstract: Filled thermoplastic molding composition containing a polycarbonate, a polyester, an olefin/carbon monoxide copolymer, a grafted core-shell elastomer, and a talc filler.
    Type: Grant
    Filed: August 21, 1990
    Date of Patent: January 21, 1992
    Assignee: The Dow Chemical Company
    Inventors: Chai-Jing Chou, Gregory M. Smith, Hani Farah
  • Halogenated copolycarbonates having improved end group selectivity and resistance to degradation
    Patent number: 5081218
    Abstract: A halogenated copolycarbonate, which contains reduced levels of phenolic end groups and end groups which result from side reactions of process chemicals with the copolycarbonate chain, has improved resistance to the degradation-inducing effects of such end groups and has improved washability.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: January 14, 1992
    Assignee: The Dow Chemical Company
    Inventor: Maurice J. Marks
  • Elimination of monocarbonate from polycarbonate
    Patent number: 4939230
    Abstract: A polycarbonate composition, and process for making same, wherein the monocarbonate and dicarbonate content is eliminated or limited to negligibly low levels by withholding introduction of chain terminator to the reaction mixture until the reaction of dihydroxy and carbonic acid derivative starting materials has run substantially to completion.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: July 3, 1990
    Assignee: The Dow Chemical Company
    Inventors: Sarat Munjal, Che I. Kao, Jimmy D. Allen
  • Polycarbonate modified with a grafted olefin copolymer
    Patent number: 4929672
    Abstract: A polycarbonate blend of good impact strength, solvent resistance and weldline properties is prepared by admixing with polycarbonate a grafted olefin/carbon monoxide copolymer and, optionally, a toughening agent such as a rubber.
    Type: Grant
    Filed: May 4, 1989
    Date of Patent: May 29, 1990
    Assignee: The Dow Chemical Company
    Inventor: Michael K. Laughner
  • Polycarbonate/styrenic blends modified with a grafted olefin copolymer
    Patent number: 4929673
    Abstract: A polycarbonate blend having both improved solvent resistance and improved impact strength comprising in admixture a polycarbonate, a styrenic thermoplastic resin, a grafted olefin/carbon monoxide copolymer and, optionally, a rubber toughening agent.
    Type: Grant
    Filed: May 4, 1989
    Date of Patent: May 29, 1990
    Assignee: The Dow Chemical Company
    Inventors: Michael K. Laughner, Gerald M. Lancaster, Yun C. Sun