Stephen D Alexander

US Patent:

6808548, Oct 26, 2004

Filed:

Dec 31, 2002

Appl. No.:

10/334881

Inventors:

Rodney R. Wilkins - Granville OH
K. Dale Montgomery - Garner NC
Stephen W. Alexander - Basking Ridge NJ
James G. Tuttle - Newburgh NY
Edwin G. Hoel - Inverness IL

Assignee:

Hollinee Glass Corporation - Shawnee OH

International Classification:

B01D 3916

US Classification:

55528, 55DIG 39, 96 68, 442 5, 442415

Abstract:

A filter material comprising a blend of at least three types of fibers: (a) polypropylene fibers (b) polymethaphenylene isophtalamide fibers and (c) fibers of a third type selected from the group of acrylic and modacrylic. In a preferred embodiment, the blend contains about ten weight percent polymethaphenylene isophtalamide fibers, about 50 weight percent polypropylene fibers and about 40 weight percent modacrylic fibers. Performance of the blend is superior to the prior art filtration materials, especially at the preferred compositions.

US Patent:

7434698, Oct 14, 2008

Filed:

Dec 31, 2003

Appl. No.:

10/750473

Inventors:

Rodney R. Wilkins - Granville OH, US
K. Dale Montgomery - Garner NC, US
Stephen W. Alexander - Basking Ridge NJ, US
James G. Tuttle - Newburgh NY, US
Edwin G. Hoel - Inverness IL, US

Assignee:

Ahlstrom Air Media LLC - Windsor Locks CT

International Classification:

B01D 39/16

US Classification:

210505, 210508, 55527

Abstract:

A filtration material comprising a blend of at least two types of fibers: (a) polypropylene fibers and (b) either acrylic or modacrylic fibers. In a preferred embodiment, the blend contains about 50 weight percent polypropylene fibers and about 50 weight percent modacrylic fibers. In another preferred embodiment, the blend contains about 50 weight percent polypropylene fibers and about 50 weight percent acrylic fibers. The fibers can be blended ranging from 90:10 to 10:90 polypropylene to acrylic or modacrylic. At least one type of fibers includes an extractable agent on the outer surfaces thereof. Performance of the blend is superior to the prior art filtration materials, especially at the preferred compositions.