Patents Represented by Law Firm Seidel, Conda, Lavorgna & Monaco
  • Decanter centrifuge having discontinuous flights in the beach area
    Patent number: 5261869
    Abstract: A decanter centrifuge including a discontinuous screw conveyor having flights only within the generally cylindrical portion of the centrifuge bowl. A restricting disc is provided adjacent to the heavy phase material discharge ports such that the restriction contacts the build-up of heavy phase within the portion of the bowl where the flights are discontinuous.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: November 16, 1993
    Assignee: Alfa Laval Separation, Inc.
    Inventors: John W. Caldwell, Raymond S. Lemmerman
  • 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