Patents Assigned to Agro-Drip, Incorporated
  • Drain pipe method
    Patent number: 4113818
    Abstract: A drain pipe of corrugated form comprising corrugations of uniform inner diameter having axially in line alternating drain holes and outward protrusions in the corrugation troughs. The drain holes are cut by a stationary knife which engages the troughs of normally formed corrugations but which are set below the level of the protrusions, thus cutting a drain hole only in alternate corrugations. Preferably drain holes and protrusions are also staggered about the circumference of each corrugation trough.
    Type: Grant
    Filed: March 2, 1977
    Date of Patent: September 12, 1978
    Assignee: Agro-Drip, Incorporated
    Inventor: Hubert Drossbach