Filter materials comprising a bipolar coating

Coating processes – Direct application of electrical – magnetic – wave – or... – Electrostatic charge – field – or force utilized

Reexamination Certificate

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C427S465000, C427S471000

Reexamination Certificate

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07070836

ABSTRACT:
The inventions directed to a process for producing non-woven fabric materials in which nano- and/or microfibers are produced by an electrostatic spinning process from a polymer melt or a polymer solution and deposited to form a non-woven fabric. A carrier material in web form is arranged or is passed through between at least two spraying devices which are in the form of electrodes for producing an electrical field and each side of the carrier material is coated with the nano- and/or microfibers of opposite polarity, which are produced by means of the spraying devices.

REFERENCES:
patent: 3380845 (1968-04-01), Shapiro et al.
patent: 4144553 (1979-03-01), Schmidt et al.
patent: 4230650 (1980-10-01), Guignard
patent: 2002/0071944 (2002-06-01), Gardner et al.
patent: 1087429 (1967-10-01), None
patent: 2328015 (1974-12-01), None
patent: 1 048 335 (2000-04-01), None

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