US5480466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filtration media
Assignee: Johns Manville
•
Filing: 1994-11-04
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Granted: 1996-01-02
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Expires: 2014-11-04
Abstract
Abstract An air filtration media comprises a single layer of randomly oriented and randomly intermingled synthetic, polymeric resin microfibers, staple fibers and bonding fibers. The microfibers, taken as a whole, have an average fiber diameter no greater than 5 microns and comprise between 50% and 90% by weight of the filtration media; the staple fibers, taken as a whole, have an average fiber diameter between 10 and 30 microns and comprise between 5% and 45% by weight of the filtration media; and the bonding fibers, taken as a whole, have an average fiber diameter between 10 and 30 microns and comprise between 5% and 25% by weight of the filtration media. The bonding fibers have thermoplastic surfaces with a lower temperature softening point than the microfibers and the staple fibers and bond the fibers together to form the air filtration media.
Inventors
- 👤 Fred L. Jackson
- 👤 Kevin P. McHugh
- 👤 John S. Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:37
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; Y10S55/12
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
200 words
A non-woven, fibrous blanket of air filtration media comprising: finite length, synthetic polymeric resin microfibers; said microfibers, taken as a whole, having an average fiber diameter between 0.5 and 5 microns; said microfibers having a softening point; and said microfibers comprising between 50% and 90% by weight of the air filtration media; finite length, synthetic polymeric resin staple fibers; said staple fibers, taken as a whole, having an average fiber diameter between 10 and 30 microns; said staple fibers having a softening point; and said staple fibers comprising between 5% and 45% by weight of the air filtration media; finite length, synthetic polymeric resin bonding fibers; said bonding fibers, taken as a whole, having an average fiber diameter between 10 and 30 microns; said bonding fibers having thermoplastic surfaces with a lower temperature softening point than the softening points of said microfibers and said staple fibers; and said bonding fibers comprising between 5% and 25% by weight of the air filtration media; and said microfibers, said staple fibers, and said bonding fibers being randomly oriented and randomly intermingled in a blanket; and said bonding fibers bonding said microfibers, said staple fibers and said bonding fibers together to form said blanket.
Claim 2
Dependent Claim
200 words
A non-woven, fibrous blanket of air filtration media comprising: finite length, synthetic polymeric resin microfibers; said microfibers, taken as a whole, having an average fiber diameter between 0.5 and 5 microns; said microfibers having a softening point; and said microfibers comprising between 50% and 90% by weight of the air filtration media; finite length, synthetic polymeric resin staple fibers; said staple fibers, taken as a whole, having an average fiber diameter between 10 and 30 microns; said staple fibers having a softening point; and said staple fibers comprising between 5% and 45% by weight of the air filtration media; finite length, synthetic polymeric resin bonding fibers; said bonding fibers, taken as a whole, having an average fiber diameter between 10 and 30 microns; said bonding fibers having thermoplastic surfaces with a lower temperature softening point than the softening points of said microfibers and said staple fibers; and said bonding fibers comprising between 5% and 25% by weight of the air filtration media; and said microfibers, said staple fibers, and said bonding fibers being randomly oriented and randomly intermingled in a blanket; and said bonding fibers bonding said microfibers, said staple fibers and said bonding fibers together to form said blanket.
Claim 3
Dependent Claim
53 words
The air filtration media of claim 1, wherein: said microfibers comprise between 50% and 85% by weight of the air filtration media; said staple fibers comprise between 5% and 40% by weight of the air filtration media; and said bonding fibers comprise between 10% and 25% by weight of the air filtration media.
Claim 4
Dependent Claim
53 words
The air filtration media of claim 1, wherein: said microfibers comprise between 50% and 60% by weight of the air filtration media; said staple fibers comprise between 20% and 40% by weight of the air filtration media; and said bonding fibers comprise between 10% and 25% by weight of the air filtration media.
Claim 5
Dependent Claim
14 words
The air filtration media of claim 3, wherein: said microfibers are made of polypropylene.
Claim 6
Dependent Claim
36 words
The air filtration media of claim 4, wherein: said blanket has a basis weight between 5 and 20 grams per square foot and is about 1/8 of an inch to about 1/4 of an inch thick.
Claim 7
Dependent Claim
53 words
The air filtration media of claim 1, wherein: said microfibers comprise between 60% and 75% by weight of the air filtration media; said staple fibers comprise between 5% and 30% by weight of the air filtration media; and said bonding fibers comprise between 10% and 25% by weight of the air filtration media.
Claim 8
Dependent Claim
14 words
The air filtration media of claim 6, wherein: said microfibers are made of polypropylene.
Claim 9
Dependent Claim
36 words
The air filtration media of claim 7, wherein: said blanket has a basis weight between 5 and 20 grams per square foot and is about 1/8 of an inch to about 1/4 of an inch thick.
Claim 10
Dependent Claim
53 words
The air filtration media of claim 1, wherein: said microfibers comprise between 75% and 85% by weight of the air filtration media; said staple fibers comprise between 5% and 15% by weight of the air filtration media; and said bonding fibers comprise between 10% and 20% by weight of the air filtration media.
Claim 11
Dependent Claim
14 words
The air filtration media of claim 9, wherein: said microfibers are made of polypropylene.
Claim 12
Dependent Claim
36 words
The air filtration media of claim 10, wherein: said blanket has a basis weight between 5 and 20 grams per square foot and is about 1/8 of an inch to about 1/4 of an inch thick.
Claim 13
Dependent Claim
59 words
The air filtration media of claim 1, wherein: said microfibers, taken as a whole, have an average fiber diameter between 1 and 3 microns; said staple fibers, taken as a whole, have an average fiber diameter between 10 and 20 microns; and said bonding fibers, taken as a whole, have an average fiber diameter between 10 and 15 microns.
Claim 14
Dependent Claim
53 words
The air filtration media of claim 12, wherein: said microfibers comprise between 50% and 85% by weight of the air filtration media; said staple fibers comprise between 5% and 40% by weight of the air filtration media; and said bonding fibers comprise between 10% and 25% by weight of the air filtration media.
Claim 15
Dependent Claim
53 words
The air filtration media of claim 12, wherein: said microfibers comprise between 50% and 60% by weight of the air filtration media; said staple fibers comprise between 20% and 40% by weight of the air filtration media; and said bonding fibers comprise between 10% and 25% by weight of the air filtration media.
Claim 16
Dependent Claim
14 words
The air filtration media of claim 14, wherein: said microfibers are made of polypropylene.
Claim 17
Dependent Claim
36 words
The air filtration media of claim 15, wherein: said blanket has a basis weight between 5 and 20 grams per square foot and is about 1/8 of an inch to about 1/4 of an inch thick.
Claim 18
Dependent Claim
53 words
The air filtration media of claim 12, wherein: said microfibers comprise between 60% and 75% by weight of the air filtration media; said staple fibers comprise between 5% and 30% by weight of the air filtration media; and said bonding fibers comprise between 10% and 25% by weight of the air filtration media.
Claim 19
Dependent Claim
14 words
The air filtration media of claim 17, wherein: said microfibers are made of polypropylene.
Claim 20
Dependent Claim
37 words
The air filtration media of claim 18, wherein: said blanket has a basis weight between 5 and 20 grams per square foot and is between about 1/8 of an inch and about 1/4 of an inch thick.
Claim 21
Dependent Claim
53 words
The air filtration media of claim 12, wherein: said microfibers comprise between 75% and 85% by weight of the air filtration media; said staple fibers comprise between 5% and 15% by weight of the air filtration media; and said bonding fibers comprise between 10% and 20% by weight of the air filtration media.
Claim 22
Dependent Claim
14 words
The air filtration media of claim 20, wherein: said microfibers are made of polypropylene.
Claim 23
Dependent Claim
37 words
The air filtration media of claim 21, wherein: said blanket has a basis weight between 5 and 20 grams per square foot and is between about 1/8 of an inch and about 1/4 of an inch thick.
Claim 24
Dependent Claim
13 words
The air filtration media of claim 12, wherein: said microfibers comprise melt-blown microfibers.
Claim 25
Dependent Claim
13 words
The air filtration media of claim 1, wherein: said microfibers comprise melt-blown microfibers.
Claim 26
Dependent Claim
143 words
A non-woven, fibrous blanket of air filtration media comprising: finite length, synthetic polymeric resin microfibers; said microfibers, taken as a whole, having an average fiber diameter of between 0.5 and 5 microns; said microfibers having a softening point; and said microfibers comprising between 75% and 85% by weight of the air filtration media; finite length, synthetic polymeric resin bonding fibers; said bonding fibers, taken as a whole, having an average fiber diameter between 10 and 30 microns; said bonding fibers having thermoplastic surfaces with a lower temperature softening point than the softening point of the microfibers; and said bonding fibers comprising between 15% and 25% by weight of the air filtration media; and said microfibers and said bonding fibers being randomly oriented and intermingled in a blanket; and said bonding fibers bonding said microfibers and said bonding fibers together to form said blanket.
Claim 27
Dependent Claim
143 words
A non-woven, fibrous blanket of air filtration media comprising: finite length, synthetic polymeric resin microfibers; said microfibers, taken as a whole, having an average fiber diameter of between 0.5 and 5 microns; said microfibers having a softening point; and said microfibers comprising between 75% and 85% by weight of the air filtration media; finite length, synthetic polymeric resin bonding fibers; said bonding fibers, taken as a whole, having an average fiber diameter between 10 and 30 microns; said bonding fibers having thermoplastic surfaces with a lower temperature softening point than the softening point of the microfibers; and said bonding fibers comprising between 15% and 25% by weight of the air filtration media; and said microfibers and said bonding fibers being randomly oriented and intermingled in a blanket; and said bonding fibers bonding said microfibers and said bonding fibers together to form said blanket.
Claim 28
Dependent Claim
42 words
The air filtration media of claim 25, wherein: said microfibers, taken as a whole, have an average fiber diameter between 1 and 3 microns; and said bonding fibers, taken as a whole, have an average fiber diameter between 10 and 15 microns.
Claim 29
Dependent Claim
13 words
The air filtration media of claim 26, wherein: said microfibers comprise melt-blown microfibers.
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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) | 1999-01-01 | 1999-07-03 | 2000-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-01 | 2003-07-03 | 2004-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-01 | 2007-07-03 | 2008-01-02 | $7700.00 | Window Closed / Lapsed |