Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Reexamination Certificate
2007-03-13
2007-03-13
Will, Thomas B. (Department: 3671)
Hydraulic and earth engineering
Drainage or irrigation
Porous or apertured pipe, flume, or tileway
C405S046000, C405S049000, C138S105000, C138S173000
Reexamination Certificate
active
10677938
ABSTRACT:
A continuous curve arch shape cross section leaching chamber made of molded thermoplastic has closely spaced corrugations and sidewalls which are perforated with slots which slope downwardly, running from interior to exterior of the chamber. The slot height and or wall thickness vary with slot clevation from the base, to achieve a desired minimum Soil Threshold Angle in the slots, where said Angle parameter relates to resistance to entry of surrounding soil. Slotted wall thickness is less than about two times the thickness of the basic chamber wall thickness elsewhere. The chamber has properties and performance approximating prior art chambers, but has substantially less normalized weight and total weight.
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Battye John R.
Brochu Ronald P.
Burnes James J.
Coppes Bryan A.
Moore, Jr. Roy E.
Infiltrator Systems Inc.
Mayo Tara L.
Nessler C.
Will Thomas B.
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