Filter unit

Gas separation – Two or more separators – Plies or layers of different characteristics or orientation

Reexamination Certificate

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Details

C055S484000, C055S485000, C055S527000, C055SDIG043, C055SDIG045, C055S482000, C210S490000, C210S491000, C210S499000, C210S500100, C442S181000, C442S239000, C442S327000, C095S286000, C095S287000

Reexamination Certificate

active

10490387

ABSTRACT:
Converting machines give rise to polluted air which must be removed with the aid of fans and filters. The invention aims at removal of the polluted air in such a way that the servicing interval is greatly extended by the use of a filter unit having a number of part-filters arranged one after the other and formed of pleated fiber mats, the various mats having different filtering properties.

REFERENCES:
patent: 3857688 (1974-12-01), Wisnewski
patent: 4419113 (1983-12-01), Smith
patent: 4801382 (1989-01-01), Kemmelmeyer
patent: 4830749 (1989-05-01), Okamoto et al.
patent: 5667544 (1997-09-01), Haas et al.
patent: 5780811 (1998-07-01), Kawamura
patent: 5976225 (1999-11-01), Nystrom et al.
patent: 6063170 (2000-05-01), Deibert
patent: 6165244 (2000-12-01), Choi
patent: 6767378 (2004-07-01), Nishiyama et al.
patent: 7169200 (2007-01-01), Kolstad et al.
patent: 2002/0073666 (2002-06-01), Cutler et al.
patent: 29 804988 (1998-08-01), None
patent: 29 909495 (1999-10-01), None

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