Absorption means

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Reexamination Certificate

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Details

C428S407000, C428S327000, C210S504000, C210S505000, C210S502100, C210S691000, C210S924000, C015S244400

Reexamination Certificate

active

06326070

ABSTRACT:

BACKGROUND OF THE INVENTION
In order to degrade or collect liquids and contaminants numerous different types of absorption means are known. Despite this, no satisfactory solution exists today for the handling of liquid discharges, for instance oil discharges. Not only large undesirable and unintentional discharges must be minimized, but it is also necessary to reduce the damage that smaller discharges may cause since their number are considerable. While a single workshop that discharges a little oil into the municipal waste system may not be a great catastrophe, if several small discharges take place at several locations and repeatedly, the pollution load will in the long run become unacceptable. In view of this the invention has as its object to provide an absorption means that is practically useful and efficient and a method for the fabrication of this, and a method to use the absorption means.
SUMMARY OF THE INVENTION
The absorption means according to the invention has as its major component saw dust that in one way or another has had the terpene content removed. Depending upon the intended use for the absorption means the saw dust will be treated differently. If water or water carried substances are to be absorbed, the sawdust is softened. This can be done in different ways, for instance by spraying the sawdust with rain water or by the use of a softening agent of a similar type as is used for the washing of textiles. In this way the treated sawdust can quickly and efficiently absorb floating pollutants where water is an essential component. Also oil and petrol can be absorbed. The absorption capacity is sufficient to almost completely dry out an underlayer. The absorption means of the present invention has a stronger suction effect on water than underlayers such as concrete, asphalt, stone etc.
Alternatively, the terpene-free sawdust may be treated with a Teflon wax so as to coat the dust particles. The sawdust treated in this way becomes hydrophobic and consequently is different from the above described absorption means in that it does not absorb water. At the same time, the ability to absorb oil seems to be considerably improved. This absorption means is therefore well suited for use with oil discharges. The oil is not repelled by the Teflon and thus can pass into the respective sawdust particles and is there sucked into the spaces that originally were filled with terpenes. Since the absorption means is selective, it can be used specifically for the control of oil or petrol and the like without absorbing the surrounding water, that otherwise may be entirely clean. Since no water bonds to the sawdust after the absorbing of the oil, the absorption means will float on the water. In this way, the absorption means is easy to collect, particularly in comparison with many of the other absorption means that exist on the market, which sink to the bottom and thus pollute, which while not visible are more difficult to cure than pollution on the surface.


REFERENCES:
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patent: 6048461 (2000-04-01), Sogell
patent: 414382 (1991-02-01), None
patent: 175804 (1994-05-01), None
patent: 9200804 (1992-01-01), None

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