Patents Assigned to EVI Cherrington Enviromental, Inc.
  • Gravel-packed pipeline and method and apparatus for installation thereof
    Patent number: 5209605
    Abstract: A gravel-packed pipeline is formed by inserting a liner pipe having a porous pipe contained therein. A conveyor pipe is attached to the liner pipe for conveying filtering material such as gravel. After positioning the liner pipe, the end of the porous pipe is pushed out and anchored. The liner is removed while the filtering material is conveyed to the hole.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: May 11, 1993
    Assignee: EVI Cherrington Enviromental, Inc.
    Inventor: Martin D. Cherrington