Patents Assigned to Subsurface Technology Corporation
  • Porous pipe and process for producing same
    Patent number: 5462092
    Abstract: A process for producing a porous pipe is disclosed and comprises forming an extrudable mixture comprising elastomer particles, binder component and a solid water carrier component having a composition other than the elastomer particles and the binder component and being associated with sufficient water to provide porosity to a porous pipe produced from the mixture; and extruding the extrudable mixture to conditions effective to form the porous pipe.
    Type: Grant
    Filed: March 23, 1994
    Date of Patent: October 31, 1995
    Assignee: Subsurface Technology Corporation
    Inventors: James J. Franz, Richard A. Hutchinson
  • Method of forming porous pipe using a blowing agent carrier component
    Patent number: 5334336
    Abstract: A process for producing a porous pipe is disclosed and includes forming an extrudable mixture comprising elastomer particles, binder component and a solid water carrier component having a composition other than the elastomer particles and the binder component and being associated with sufficient water to provide porosity to a porous pipe produced from the mixture; and extruding the extrudable mixture to conditions effective to form the porous pipe.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: August 2, 1994
    Assignee: Subsurface Technology Corporation
    Inventors: James J. Franz, Richard A. Hutchinson