Herbicide Foam

The applications listed here emphasize foam as a delivery system for herbicides designed to kill roots in sewer systems. Although the technology seems fairly simple, there are many unseen complications — most notably, and not obvious at first glance, is the pressure required for pushing the foam through long lengths of sewer pipe compared to the pressure drop connecting the laterals feeding the main sewer line — one does not want the sewer foam venting through your kitchen sink!!

  • Horne, F.F., U.S. Patent 3,874,926, April 1, 1975
    Method and Apparatus for Injecting Foam into a Pipe
  • Horne, F.F., U.S. Patent 3,880,176, April 29, 1975
    Apparatus for Sewer Treatment to Kill Tree Roots and Other Organic Growth Therewithin
  • Horne, F.F., U.S. Patent 3,892,588, July 1, 1975
    Method of Killing Roots and organic Growths in Sewer Pipes
  • Horne, F.F., U.S. Patent 4,025,360, May 24, 1977
    Method and Apparatus for Injecting Foam into a Pipeline, Including an Inflatable Plug
  • Horne, F.F., U.S. Patent 4,083,384, April 11, 1978
    Method and Apparatus for Injecting Foam into a Pipeline, Including an Inflatable Plug
  • Monaghan, J.D., U.S. Patent 5,735,955, April 7, 1998
    Apparatus for Generating and Dispersing Foam Herbicide Within a Sewer
  • Malavenda, A., U.S. Patent 5,919,731, July 6, 1999
    Method for Controlling Root Growth Using Diquat Bromide