Patents by Inventor Kannappan Chockalingam

Kannappan Chockalingam 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).

  • Preparation of 2-(1,3-dimethylbutyl)aniline and other branched alkyl-substituted-anilines
    Patent number: 8236988
    Abstract: Methods are provided for preparing branched alkyl-substituted-anilines, such as 2-(1,3-dimethylbutyl)aniline. Such methods comprise combining aniline, an alkyl-substituted-1-alkene, such as 4-methyl-i-pentene, and an aluminum alkyl catalyst.
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: August 7, 2012
    Assignee: Albemarle Corporation
    Inventor: Kannappan Chockalingam
  • PREPARATION OF 2-(1,3-DIMETHYLBUTYL)ANILINE AND OTHER BRANCHED ALKYL-SUBSTITUTED-ANILINES
    Publication number: 20110237835
    Abstract: Methods are provided for preparing branched alkyl-substituted-anilines, such as 2-(1,3-dimethylbutyl)aniline. Such methods comprise combining aniline, an alkyl-substituted-1-alkene, such as 4-methyl-i-pentene, and an aluminum alkyl catalyst.
    Type: Application
    Filed: August 1, 2008
    Publication date: September 29, 2011
    Applicant: Albemarle Corporation
    Inventor: Kannappan Chockalingam
  • Method for producing calcium salts of [S,S]-ethylenediamine-N,N'-disuccinic acid
    Patent number: 5550285
    Abstract: This invention relates to a process for the production of a solid calcium [S,S]-ethylenediamine-N,N'-disuccinate by the reaction of calcium aspartate and dihaloethane in an aqueous solvent.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: August 27, 1996
    Inventors: William J. Layman, Jr., Kannappan Chockalingam, Jean-Pierre Lecouv e
  • Process for preparing carboxylic acids by carbonylation of ethers and thioethers
    Patent number: 5399747
    Abstract: A new process for preparing aryl-substituted aliphatic carboxylic acids is provided. Aryl-substituted aliphatic ether or thioether compound is reacted with carbon monoxide in aqueous conditions at a temperature between about 25.degree. C. and about 200.degree. C. An acid such as hydrochloric acid may be added. As catalyst, a mixture of palladium or a palladium compound and a copper compound with at least one acid-stable ligand are present.
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: March 21, 1995
    Assignee: Albemarle Corporation
    Inventors: Kannappan Chockalingam, Tse-Chong Wu
  • Catalytic carbonylation of ethers and thioethers
    Patent number: 5315030
    Abstract: A new process for preparing aliphatic carboxylic acid esters is provided. A substituted aliphatic ether or thioether compound is reacted with carbon monoxide in the presence of an alcohol in anhydrous conditions at a temperature between about 25.degree. C. and about 200.degree. C. An excess of several moles of anhydrous alcohol is preferred. An acid such as hydrochloric acid may also be added. As catalyst, a mixture of palladium or a palladium compound and a copper compound with at least one acid-stable ligand are present.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: May 24, 1994
    Assignee: Ethyl Corporation
    Inventors: Kannappan Chockalingam, Tse-Chong Wu
  • Process for preparing aryl-substituted aliphatic carboxylic acid esters by carbonylation
    Patent number: 5315029
    Abstract: A new process for preparing alkyl esters of ibuprofen is provided. A 1-halo-1-(4-isobutylphenyl)ethane is reacted with carbon monoxide in the presence of an anhydrous alcohol at a temperature between about 10.degree. C. and about 200.degree. C. An excess of several moles of alcohol is preferred. An acid such as trifluoroacetic acid is also added. As catalyst, a palladium compound and at least one acid-stable ligand over palladium are present; however, an excess of ligand over palladium is advantageous.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: May 24, 1994
    Assignee: Ethyl Corporation
    Inventor: Kannappan Chockalingam
  • Preparation of aryl-substituted aliphatic carboxylic acid esters by catalytic carbonylation
    Patent number: 5278335
    Abstract: A new process for preparing alkyl esters of ibuprofen is provided. A 1-halo-1-(4-isobutylphenyl)ethane is reacted with carbon monoxide in the presence of an anhydrous alcohol at a temperature between about 10.degree. C. and about 200.degree. C. An excess of several moles of alcohol is preferred. An acid such as trifluoroacetic acid is also added. As catalyst, a mixture of a copper compound and a palladium or a palladium compound and at least one acid-stable ligand are present.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: January 11, 1994
    Assignee: Ethyl Corporation
    Inventor: Kannappan Chockalingam