Patents Assigned to Advanced Drainage Systems, Inc.
  • Patent number: 3936961
    Abstract: Device for covering drainage tubing with fine textured soil granules comprises main framework with pair of tillers connected thereto by adjustable connection which varies elevation of tillers relative to main framework. Each tiller includes vertically oriented shaft journaled to secondary frame, and tines extend outwardly from each shaft. Motivators are connected to rotate each shaft so that tines penetrate side walls of trench in which drainage tubing has been positioned to thereby break away fine textured soil granules and shower them over drainage tubing.
    Type: Grant
    Filed: April 25, 1974
    Date of Patent: February 10, 1976
    Assignee: Advanced Drainage Systems, Inc.
    Inventor: Lester Gahler