Patent JPS6180221A successfully refreshed from Google Patents.
Patent US4070519A successfully refreshed from Google Patents.
US4070519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature filter fabrics
Assignee: Air Purator Corp
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Filing: 1976-04-27
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Granted: 1978-01-24
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Expires: 1996-04-27
Abstract
Abstract Generally, the present invention relates to a resin-treated filter fabric which comprises a surface or batt layer comprised of glass fibers which is joined, by needling, to an underlayer which is comprised of mineral fibers. The present invention includes within its scope a method of manufacturing such a filter fabric.
Inventors
- 👤 Leonard R. Lefkowitz
- 👤 W. Henrik Krohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:34
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B01D39/2003; B01D39/2017; B01D39/2024; B01D39/2027; B01D39/2041; B01D39/2048; B32B17/00; B32B17/06; B32B17/067; B32B19/00; B32B19/06; B32B19/08; B32B5/02; B32B5/022; B32B5/024; B32B5/06; D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/48; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/10; B32B2262/101; B32B2262/105; B32B2307/00; B32B2307/40; B32B2307/42; B32B2315/00; B32B2315/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T442/00; Y10T442/30; Y10T442/3065; Y10T442/3073; Y10T442/3707; Y10T442/3724; Y10T442/3764
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
55 words
A filter fabric comprising a non-woven fibrous surface layer needled to a woven base layer characterized by the fact that said surface layer comprises glass fibers which are 2 to 8 microns in diameter, said base layer comprises yarns which comprise mineral fibers, and said surface layer and said base layer are impregnated with resin.
Claim 2
Dependent Claim
55 words
A filter fabric comprising a non-woven fibrous surface layer needled to a woven base layer characterized by the fact that said surface layer comprises glass fibers which are 2 to 8 microns in diameter, said base layer comprises yarns which comprise mineral fibers, and said surface layer and said base layer are impregnated with resin.
Claim 3
Dependent Claim
19 words
A filter fabric are recited in claim 1 wherein said base layer comprises woven yarns which comprise asbestos fibers.
Claim 4
Dependent Claim
15 words
A filter fabric as recited in claim 1 wherein said base layer comprises glass fibers.
Claim 5
Dependent Claim
26 words
A filter fabric as recited in claim 1 wherein said base layer is a woven construction comprising yarns which comprise asbestos fibers and a metal core.
Claim 6
Dependent Claim
25 words
A filter fabric as recited in claim 1 wherein said ratio, by weight, of said glass fibers to said mineral fibers is 1 to 1.5.
Claim 7
Dependent Claim
21 words
A filter fabric as recited in claim 1 wherein said surface layer is a blend of carrier fibers and glass fibers.
Claim 8
Dependent Claim
17 words
A filter fabric as recited in claim 2 wherein said constituent mineral fibers are coated with resin.
Claim 9
Dependent Claim
18 words
A filter fabric as recited in claim 1, wherein said base layer comprises yarns which comprise ceramic fibers.
Claim 10
Dependent Claim
19 words
A filter fabric as recited in claim 1 wherein said glass fibers are 3 to 5 microns in diameter.
Claim 11
Dependent Claim
14 words
A filter fabric as recited in claim 1 wherein said resin is a thermoplastic.
Claim 12
Dependent Claim
15 words
A filter fabric as recited in claim 1 wherein said resin is a silicone composite.
Claim 13
Dependent Claim
15 words
A filter fabric as recited in claim 1 wherein said resin is a polyimide composites.
Claim 14
Dependent Claim
83 words
A filter fabric comprising a non-woven fibrous surface layer needled to an underlayer characterized by the fact that said surface layer comprises glass fibers which are 3 to 5 microns in diameter and which are blended with an antistatic material, said base layer is a woven construction and comprises yarns which comprise asbestos fibers, the ratio, by weight, of said glass fibers to said asbestos fibers is 1 to 1.5, and said surface layer and said underlayer are impregnated with a silicone resin.
Claim 15
Dependent Claim
83 words
A filter fabric comprising a non-woven fibrous surface layer needled to an underlayer characterized by the fact that said surface layer comprises glass fibers which are 3 to 5 microns in diameter and which are blended with an antistatic material, said base layer is a woven construction and comprises yarns which comprise asbestos fibers, the ratio, by weight, of said glass fibers to said asbestos fibers is 1 to 1.5, and said surface layer and said underlayer are impregnated with a silicone resin.
Claim 16
Dependent Claim
16 words
A filter fabric as recited in claim 1 wherein said mineral fibers are coated with resin.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |