Pipe joints or couplings – Sleeve
Reexamination Certificate
2011-03-22
2011-03-22
Hewitt, James M (Department: 3679)
Pipe joints or couplings
Sleeve
C285S053000, C285S235000, C285S236000, C285S238000, C405S047000
Reexamination Certificate
active
07909370
ABSTRACT:
A root-repellant underground drain-pipe coupling, which may be made of the same resilient rubber-like material as sleeve-type drain-pipe couplings of known art, is made somewhat longer than conventional coupling sleeves and is fitted internally at each end with a thin collar of root-repelling material such as copper sheet. Each collar is located just inside the outer entrance to the interfacing regions, held in place by a clamp strap around the sleeve, and optionally made with a portion extending outwardly as an extension or flange for purposes of inspection and increased effectiveness.
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Hewitt James M
McTaggart J. E.
Ripley Jay R
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