Patents by Inventor Robert B. Hager

Robert B. Hager 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 producing alkylthio- and arylthio-substituted carboxylic acids and their thioesters
    Patent number: 5175310
    Abstract: A process is provided for producing alkylthio-substituted carboxylic acids and arylthio-substituted carboxylic acids and their corresponding alkylthio-substituted thioesters and arylthio-substituted thioesters. The process comprises reacting a mercaptan with a lactone in the presence of an acidic catalyst at temperatures of about 100.degree. C. to about 350.degree. C. The process for preparing the thio-substituted carboxylic acids and thio-substituted thioesters may be a continuous process or a batch process.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: December 29, 1992
    Assignee: Elf Atochem North America, Inc.
    Inventors: Michael J. Lindstrom, Bernard Buchholz, Robert B. Hager
  • 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
  • Process for the manufacture of dialkyl disulfides and polysulfides
    Patent number: 4937385
    Abstract: A process is disclosed for continuously preparing dialkyl disulfides and dialkyl polysulfides by reacting at elevated temperature and in the presence of a solid, particulate catalyst an alkene and hydrogen sulfide in a first reaction zone, and then passing the reactor effluent into a second reaction zone where it is reacted at elevated temperature with molten, elemental sulfur in the presence of a solid, particulate catalyst.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: June 26, 1990
    Assignee: Pennwalt Corporation
    Inventors: Bernard Buchholz, Edward J. Dzierza, Robert B. Hager
  • Process for converting dialkyl sulfides to alkyl mercaptans
    Patent number: 4396778
    Abstract: A continuous process is provided for the vapor-phase preparation of C.sub.1 -C.sub.18 alkyl mercaptans where a di C.sub.1 -C.sub.18 alkyl sulfide is reacted with a molar excess of hydrogen sulfide at elevated temperature in the presence of a specified synthetic zeolite containing at least 10 percent by weight of an alkali metal, expressed as Na.sub.2 O.
    Type: Grant
    Filed: December 17, 1981
    Date of Patent: August 2, 1983
    Assignee: Pennwalt Corporation
    Inventor: Robert B. Hager
  • Process for converting dialkyl sulfides to alkyl mercaptans
    Patent number: 4313006
    Abstract: A process is provided for preparing alkyl mercaptans by reacting a dialkyl sulfide with hydrogen sulfide in the presence of a zeolite catalyst.
    Type: Grant
    Filed: September 3, 1980
    Date of Patent: January 26, 1982
    Assignee: Pennwalt Corporation
    Inventor: Robert B. Hager