US5336286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency air filtration media
Assignee: CNA Holdings LLC
•
Filing: 1993-04-26
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Granted: 1994-08-09
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Expires: 2013-04-26
Abstract
Abstract A high efficiency air filtration media comprises: about 5 to about 20% by weight of fibrids; about 5 to about 20% by weight of a binder; and about 60 to about 90% by weight of staple fiber. The media has a pressure drop of air across a face of the media of less than or equal to 0.4 inches of water. The media, also, has a sodium chloride particulate test for respirator filter percent efficiency of greater than or equal to 60%.
Inventors
- 👤 Paul R. Alexander, Jr.
- 👤 Donald G. Cain
- 👤 Erika J. Dougherty
- 👤 Theodore S. Thornburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:59
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
A high efficiency air filtration media comprising: about 5 to about 20% by weight of fibrids; about 5 to about 20% by weight of binder; about 60 to about 90% by weight of staple fiber; said media being substantially free of glass fibers, having a pressure drop of air across a face of said media less than or equal to 0.4 inches of water at a face velocity of 10.5 feet per minute, a sodium chloride particulate test for respirator filter percent efficiency of greater than or equal to 60%, and a basis weight ranging from about 2.5 ounces per square yard to about 5.0 ounces per square yard.
Claim 2
Dependent Claim
109 words
A high efficiency air filtration media comprising: about 5 to about 20% by weight of fibrids; about 5 to about 20% by weight of binder; about 60 to about 90% by weight of staple fiber; said media being substantially free of glass fibers, having a pressure drop of air across a face of said media less than or equal to 0.4 inches of water at a face velocity of 10.5 feet per minute, a sodium chloride particulate test for respirator filter percent efficiency of greater than or equal to 60%, and a basis weight ranging from about 2.5 ounces per square yard to about 5.0 ounces per square yard.
Claim 3
Dependent Claim
26 words
The media according to claim 1 wherein said fibrids being selected from the group consisting of cellulose ester fibrids, acrylic fibrids, polyester fibrids, or combinations thereof.
Claim 4
Dependent Claim
28 words
The media according to claim 1 wherein said binder being selected from the group selected from the group consisting of binder resins, binder fibers, heterofils, or combinations thereof.
Claim 5
Dependent Claim
22 words
The media according to claim 1 wherein said staple fiber having a denier per filament ranging from about 0.3 to about 1.5.
Claim 6
Dependent Claim
22 words
The media according to claim 1 wherein said staple fiber having a length ranging from about 1/4 inches to about 1/2 inches.
Claim 7
Dependent Claim
15 words
The media according to claim 1 wherein said media being substantially free of glass fibers.
Claim 8
Dependent Claim
121 words
A high efficiency air filtration media comprising: about 5 to about 10% of a cellulose ester fibrid; about 5 to about 20% of a binder selected from the group consisting of binder resins and heterofils; about 70 to about 90% of a polyester staple fiber; and said media being substantially free of glass fibers and having a pressure drop of air across a face of said media less than or equal to 0.4 inches of water at a face velocity of 10.5 feet per minute, a sodium chloride particulate test for respirator filter percent efficiency of greater than or equal to 60%, and a basis weight ranging from about 2.5 ounces per square yard to about 5.0 ounces per square yard.
Claim 9
Dependent Claim
121 words
A high efficiency air filtration media comprising: about 5 to about 10% of a cellulose ester fibrid; about 5 to about 20% of a binder selected from the group consisting of binder resins and heterofils; about 70 to about 90% of a polyester staple fiber; and said media being substantially free of glass fibers and having a pressure drop of air across a face of said media less than or equal to 0.4 inches of water at a face velocity of 10.5 feet per minute, a sodium chloride particulate test for respirator filter percent efficiency of greater than or equal to 60%, and a basis weight ranging from about 2.5 ounces per square yard to about 5.0 ounces per square yard.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-08 | 1998-02-07 | 1998-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-08 | 2002-02-07 | 2002-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-08 | 2006-02-07 | 2006-08-09 | $7700.00 | Window Closed / Lapsed |