Gas separation – Specific media material – Fibrous or strand form
Reexamination Certificate
1998-12-09
2002-08-27
Smith, Duane S. (Department: 1724)
Gas separation
Specific media material
Fibrous or strand form
C055S528000, C055SDIG005, C019S098000, C019S296000, C019S304000, C028S104000
Reexamination Certificate
active
06440192
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention concerns a process for manufacturing a filtration device more particularly intended for filtering gases such as air for ventilating and/or heating and/or air conditioning rooms or motor vehicles.
The invention also concerns a filtration device manufactured by the above process.
Prior art filtration devices are made by spinning a thermoplastics polymer through nozzles to produce an intermingling of the filaments issuing from the nozzles forming, after cooling, a lap that can constitute a particle filter.
The prior art processes have the drawback of necessitating the superposition and binding together of a plurality of layers in order to obtain filters that are sufficiently efficient.
The filters obtained in this way have a high specific gravity and a high unit cost.
BRIEF SUMMARY OF THE INVENTION
An aim of the invention is to manufacture a filtration device that is efficient and less dense and more economic than the prior art devices.
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Guerin Richard
Legrand Claude
Smith Duane S.
Valeo
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