Patents by Inventor Paul D. Krawczyk

Paul D. Krawczyk 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).

  • Dry solids pump system for feeding a high pressure combustor
    Patent number: 5560550
    Abstract: A method for feeding a dry pulverized solid material such as coal or limestone into a high pressure combustor is disclosed which employs a high pressure combustor is disclosed which employs a high pressure dry solids pump. The material is first pulverized and transported with air to a separator. The separated solids are temporarily accumulated and fed to one or more dry solids pump which continuously discharge the compact solids at high pressure into a gas mixing chamber. The compact solids are mixed with transport air as a dense phase for transport to the high pressure combustor.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: October 1, 1996
    Assignee: Combustion Engineering, Inc.
    Inventor: Paul D. Krawczyk
  • Rotating drum end seal
    Patent number: 4650340
    Abstract: Apparatus for sealing an opening (12) in the end face (13) of a rotating drum (10), including a stationary backing plate (24), annular seal ring (20), surrounding the opening and extending in a sealing manner between the backing plate and the end face, resilient means (30 or 52) biasing the sealing ring into contact with the end face, and adjustable means (36 or 56, 58) for varying the force exerted by the resilient means.
    Type: Grant
    Filed: November 1, 1985
    Date of Patent: March 17, 1987
    Assignee: Combustion Engineering, Inc.
    Inventors: Paul D. Krawczyk, Alexander Bosso