Hydraulic and earth engineering – Drainage or irrigation – Porous waterway – e.g. – sand drain – etc.
Reexamination Certificate
2005-03-15
2005-03-15
Lagman, Frederick L. (Department: 3673)
Hydraulic and earth engineering
Drainage or irrigation
Porous waterway, e.g., sand drain, etc.
C405S036000, C052S169500
Reexamination Certificate
active
06866447
ABSTRACT:
A non-biodegradable, unitary drainage device of highly flexible character. The invention features a monolithic, sandwich construct consisting of membranous, planar top and, optional-use, bottom sheets which form a wrap/envelope or covering on a planar array of quasi-tubular supports or “stand-off ”elements. Actual positioning of the supports in their planar array is varied, with parallel-interleaving, cross-lining and intertwining of supports, of either or both embodiments, being done to acquire varying degrees of strength and flexibility. Depending on specific function to be performed, the covering sheet(s) may be of differing materials, for either particulate filtering or fluid impermeability (sealing). A connection adjunct is provided that allows direct fluid communication from support(s) of one such monolith to another.
REFERENCES:
patent: 3965686 (1976-06-01), Saito et al.
patent: 4019326 (1977-04-01), Herveling et al.
patent: 4995759 (1991-02-01), Plowman et al.
patent: 5152892 (1992-10-01), Chambers
patent: 6527474 (2003-03-01), Nabeshima
patent: 6702517 (2004-03-01), Goddard
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