Patents by Inventor Maher Y. Elsheikh

Maher Y. Elsheikh 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).

  • Inhibition of 141B decomposition
    Patent number: 5567281
    Abstract: Inhibition of the formation of unsaturated carbon compounds during the heating of 141b involving the addition of various inhibitors such as butylene oxide and/or the use of a vessel made of a nickel alloy.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: October 22, 1996
    Assignee: Elf Atochem North America, Incorporated
    Inventors: Richard M. Crooker, Maher Y. Elsheikh, Anthony D. Kelton, Morris P. Walker, Danny W. Wright
  • Inhibition of 141B decomposition
    Patent number: 5531867
    Abstract: Inhibition of the formation of unsaturated carbon compounds during the heating of 141b involving the addition of various inhibitors such as butylene oxide and/or the use of a vessel made of a nickel alloy.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: July 2, 1996
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh, Anthony D. Kelton, Morris P. Walker, Danny W. Wright
  • Gas phase process for the production of 1,1-dichloro-1-fluoroethane and/or 1-chloro-1,1-difluoroethane from vinylidene chloride
    Patent number: 5449842
    Abstract: A novel gas phase process for the production of 1,1-dichloro-1-fluoroethane from vinylidene chloride and hydrogen fluoride is provided. The process is characterized by high conversion of vinylidene chloride to product, with a high selectivity for 1,1-dichloro-1-fluoroethane. The process may also be operated to selectively form 1-chloro-1,1-difluoroethane. Few volatile by-products and substantially no tar or oligomeric material is formed. Catalyst performance remains constant over extended periods of time.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: September 12, 1995
    Assignee: Atochem North America, Inc.
    Inventor: Maher Y. Elsheikh
  • Stabilized 141b
    Patent number: 5246626
    Abstract: Storage-stable 141b prepared by contacting 141b with alumina at temperatures of about 0-100 degrees Centigrade, compositions containing the thus treated 141b, and uses thereof for the production of polyurethane and polyisocyanurate foams.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: September 21, 1993
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh
  • Stabilized 141B
    Patent number: 5246625
    Abstract: Storage-stable 141b prepared by contacting 141b with alumina at temperatures of about 0-100 degrees Centigrade, compositions containing the thus treated 141b, and uses thereof for the production of polyurethane and polyisocyanurate foams.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: September 21, 1993
    Assignee: EH Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh
  • Stabilized 14lb
    Patent number: 5221697
    Abstract: Storage-stable 141b prepared by contacting 141b with alumina at temperatures of about 0-100 degrees Centigrade, compositions containing the thus treated 141b, and uses thereof for the production of polyurethane and polyisocyanurate foams.
    Type: Grant
    Filed: November 18, 1992
    Date of Patent: June 22, 1993
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh
  • Manufacture of hydrofluorocarbons
    Patent number: 5208395
    Abstract: A novel, heterogeneously-catalyzed, gas phase process for the production of 32 and 152a which comprises contacting the corresponding 1,1-dichloroalkane and HF in the vapor phase in the presence of a Lewis acid catalyst such as tin tetrachloride.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: May 4, 1993
    Assignee: Elf Atochem North America, Inc.
    Inventor: Maher Y. Elsheikh
  • Stabilized 141b
    Patent number: 5177270
    Abstract: Compositions of 141b which are stabilized with 4-benzyloxyphenol or 2,6-di-t-butyl-4-methylphenol.
    Type: Grant
    Filed: October 9, 1991
    Date of Patent: January 5, 1993
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh
  • Production of vinylidene fluoride
    Patent number: 5177271
    Abstract: Production of vinylidene fluoride by contacting 143a and HCl in the gas phase at 300-700 C.
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: January 5, 1993
    Assignee: Elf Atochem North America, Inc.
    Inventors: Maher Y. Elsheikh, Michael S. Bolmer
  • Stabilized 141b
    Patent number: 5169996
    Abstract: HCFC blowing agents such as 141b which are stabilized with diethylhydroxylamine, 1,4-benzoquinone, or 2,6-di-t-butylbenzoquinone.
    Type: Grant
    Filed: October 9, 1991
    Date of Patent: December 8, 1992
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh, Robert B. Hager
  • Stabilized 1,1-dichloro-1-fluoroethane
    Patent number: 5169997
    Abstract: HCFC blowing agents such as 141b which are stabilized with halogen-containing inhibitors such as benzyl bromide.
    Type: Grant
    Filed: October 9, 1991
    Date of Patent: December 8, 1992
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh
  • Stabilized 141b
    Patent number: 5169874
    Abstract: HCFC blowing agents such as 141b which are stabilized with alpha-pinene oxide, limonene dioxide, or 1,2-hexadecene oxide.
    Type: Grant
    Filed: May 6, 1992
    Date of Patent: December 8, 1992
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh, John A. Murphy
  • Inhibited 141b
    Patent number: 5169995
    Abstract: Storage-stable compositions of 141b which are inhibited against decomposition with additives such as alpha-methylstyrene.
    Type: Grant
    Filed: October 9, 1991
    Date of Patent: December 8, 1992
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, James P. Lavelle, Maher Y. Elsheikh
  • Stabilized 14 lb
    Patent number: 5135680
    Abstract: HCFC blowing agents such as 14lb which are stabilized with alpha-pinene oxide, limonene dioxide, or 1,2-hexadecene oxide.
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: August 4, 1992
    Assignee: Elf Atochem North America, Inc.
    Inventors: Richard M. Crooker, Maher Y. Elsheikh, John A. Murphy
  • Solvent extraction of I-365 from I-141b
    Patent number: 5099081
    Abstract: Partial or total separation of a mixture of 1,1,1,3,4-pentafluorobutane and 1,1-dichloro-1-fluoroethane by liquid-liquid extraction with methanol based solvent mixtures, such as methanol with ethanolamine or ethylene glycol.
    Type: Grant
    Filed: August 28, 1991
    Date of Patent: March 24, 1992
    Assignee: Atochem North America, Inc.
    Inventors: Michael S. Bolmer, Maher Y. Elsheikh
  • Solvent extraction of I-141B from I-365
    Patent number: 5099082
    Abstract: Partial or total separation of a mixture of 1,1,1,3,3-pentafluorobutane and 1,1-dichloro-1-fluoroethane by liquid-liquid extraction with solvents containing ethylene glycol, 2-butene-1,4-diol, ethanolamine, propylene glycol, or mixtures thereof, preferably ethylene glycol.
    Type: Grant
    Filed: August 28, 1991
    Date of Patent: March 24, 1992
    Assignee: Atochem North America, Inc.
    Inventors: Michael S. Bolmer, Maher Y. Elsheikh
  • Process for producing 1,1-dichloro-1-fluoroethane and/or 1-chloro-1,1-difluoroethane free of vinylidene chloride
    Patent number: 4962244
    Abstract: 1,1-Dichloro-1-fluoroethane and 1-chloro-1,1-difluoroethane are prepared from the liquid phase fluorination of 1,1,1-trichloroethane by HF in the presence of a homogenous catalyst. 1,1-Dichloro-1-fluoroethane or 1-chloro-1,1-difluoroethane are selectively produced substantially free of vinylidene chloride.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: October 9, 1990
    Assignee: Atochem North America, Inc.
    Inventor: Maher Y. Elsheikh
  • Process for preparing vinylidene fluoride by the direct fluorination of vinylidene chloride
    Patent number: 4827055
    Abstract: Vinylidene fluoride is produced by the gaseous phase reaction of vinylidene chloride with hydrofluoric acid at a temperature of from about 400.degree. to 700.degree. C. in the presence of oxygen and a catalyst containing AlF.sub.3 either alone or in combination with a transition metal fluoride selected from iron, cobalt, chromium, nickel, zinc and combinations thereof.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: May 2, 1989
    Assignee: Pennwalt Corporation
    Inventor: Maher Y. Elsheikh