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US 4,900,010 AGranted
Athletic field and playground
OwnerBernd Wengmann, Ernst Habeggerinventors
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OwnerBernd Wengmann, Ernst Habeggerinventors
Estimating the term…
An athletic field or playground having an essentially planar surface consisting, at least in part, of tree bark particles consolidated to form an essentially tread resistant top layer of the athletic field or playground; the top layer consists, at least predominantly, of a mixture of particulate tree bark and of flexible fibers dispersed in the mixture; an at least predominant portion of the fibers has a fiber length that is greater than the average largest dimension of the tree bark particles. Natural or synthetic fibers may be used in the mixture if their rot resistance is at least about that of the tree bark particles, and coconut fibers each having a length of at least about 2 inches and used in a proportion of from about 0.01 to 10%, based upon the dry weight of the tree bark, are a typical example. Construction and maintenance costs of such fields are low when compared to fields having a top layer of natural or manmade grass, and neither the impact of heavy rain showers nor of the most intensive use will diminish the most favorable properties regarding player safety and comfort.
An athletic field or playground having an essentially planar and water-permeable surface consisting, at least in part, of tree bark particles consolidated to form an essentially tread-resistant top layer of said field or playground;
An athletic field having an essentially planar and water-permeable surface layer consisting, at least predominantly, of tree bark particles consolidated to form an essentially tread-resistant top layer;
A method of building an athletic field or playground having an essentially planar and water-permeable surface provided on a supporting ground structure;
A method of building an athletic field or playground having an essentially planar and waterpermeable surface provided on a supporting ground structure;
Dependencies are inferred from the claim text.