Filter unit

Details Filter unit Filter unit

2008-03-18

2008-03-18

Smith, Duane (Department: 1797)

Gas separation

Two or more separators

Plies or layers of different characteristics or orientation

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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