US4113535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature filter fabrics
Assignee: Huyck Corp
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Filing: 1977-09-12
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Granted: 1978-09-12
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Expires: 1997-09-12
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
2026-10-26 02:53
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B01; B01D; B01D39/00; B01D39/14; B01D39/20; 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: 12
Claim 1
Independent Claim
97 words
A method of making a filter fabric comprising the steps of: (a) mixing a lubricating agent with glass fibers having a diameter of from 2-8 microns; (b) forming a non-woven batt layer from said glass fibers; (c) forming a base layer from mineral fibers; (d) resin impregnating and needling together said base layer and said batt; (e) pressing said fabric to a degree sufficient to obtain a predetermined resin solids pickup; (f) drying said fabric at a temperature sufficient to remove any liquid solvent; and (g) heating said fabric at a temperature sufficient to cure said resin.
Claim 2
Independent Claim
97 words
A method of making a filter fabric comprising the steps of: (a) mixing a lubricating agent with glass fibers having a diameter of from 2-8 microns; (b) forming a non-woven batt layer from said glass fibers; (c) forming a base layer from mineral fibers; (d) resin impregnating and needling together said base layer and said batt; (e) pressing said fabric to a degree sufficient to obtain a predetermined resin solids pickup; (f) drying said fabric at a temperature sufficient to remove any liquid solvent; and (g) heating said fabric at a temperature sufficient to cure said resin.
Claim 3
Dependent Claim
24 words
A method as described in claim 1 wherein said mixing step includes mixing an antistatic material with said lubricating agent and said glass fibers.
Claim 4
Dependent Claim
26 words
A method as described in claim 2 wherein said mixing step includes blending carrier fibers with said lubricating agent, said glass fibers, and said antistatic material.
Claim 5
Dependent Claim
23 words
A method as described in claim 1 wherein said mixing step includes blending carrier fibers with said lubricating agent and said glass fibers.
Claim 6
Dependent Claim
20 words
A method as described in claim 1 wherein said forming step includes weaving yarns to form a woven base layer.
Claim 7
Dependent Claim
16 words
A method as described in claim 1 wherein said batt is formed by carding and cross-lapping.
Claim 8
Dependent Claim
15 words
A method as described in claim 1 wherein said batt is formed by air laying.
Claim 9
Dependent Claim
18 words
A method as described in claim 1 wherein said resin is cured at from 300° to 400° Fahrenheit.
Claim 10
Dependent Claim
34 words
A method as described in claim 1 including the steps of impregnating said batt layer with resin, impregnating said base layer with resin, and then needling together said batt layer and said base layer.
Claim 11
Dependent Claim
26 words
A method as described in claim 1 including the step of needling together said batt layer and said base layer and then impregnating the composite structure.
Claim 12
Dependent Claim
23 words
A method as described in claim 1 including the step of coating said mineral fibers with resin prior to forming said base layer.
References Cited (Backward Citations)
US3356561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |