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US 4,074,997 AGranted
Plant plug
OwnerMerrill Coheninventor
Life of this patent
Estimating the term…
Abstract
A molded nutrient-containing plant-growth medium secured to a weighted base permits the growth of plants in an aquarium without contaminating water in the aquarium with floating soil.
Claims4
A weighted water-retaining, non-rigid, open-cell, substantially homogeneous polyurethane-foam/soil composition comprising moisture and a plant food enriched admixture of loam, clay, peat moss and builders' sand integrally incorporated as filler in sufficient water-cured hydrophilic-polyurethane-prepolymer foam to sustain the composition as an integral solid which has a sufficiently-high average density to preclude its floating in water.
Dependencies are inferred from the claim text.