US4755423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminate
Assignee: Hoechst AG
•
Filing: 1987-02-19
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Granted: 1988-07-05
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Expires: 2007-02-19
Abstract
Abstract Laminates, which are composed of a preconsolidated synthetic fiber web and a preconsolidated mineral fiber web, which are bonded to each other by needling, are improved in respect of their dimensional stability, in particular in the transverse direction, when the preconsolidated mineral fiber wet contains reinforcing yarns of a mineral material and extending in the longitudinal direction. They are preferably used as carrier web for roofing and sealing webs.
Inventors
- 👤 Wolfgang Greiser
- 👤 Kurt Plotz
- 👤 Hans Wagner
- 👤 Karl-Christian Zerfass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:08
CPC Classifications
D; D04; D04H; D04H5/00; D04H5/12; D04H1/00; D04H1/40; D04H1/42; D04H1/4209; D04H1/4218; D04H1/4326; D04H1/435; D04H1/44; D04H1/46; D04H1/498; D04H1/58; D04H1/593; D04H1/70; D04H1/72; D04H1/732; D04H5/02; D04H5/04; Y; Y10; Y10T; Y10T428/00; Y10T428/27; Y10T428/31504; Y10T428/31815; Y10T442/00; Y10T442/60; Y10T442/643; Y10T442/644; Y10T442/682; Y10T442/684; Y10T442/686; Y10T442/696
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A laminate, having improved dimensional stability and fire resistance and being preferably applied as a carrier web for roofing sheets, comprising the combination of a preconsolidated synthetic fiber web and a preconsolidated mineral fiber web, which are bonded to each other by needling, wherein the mineral fiber web contains longitudinal reinforcing yarns made of a mineral material.
Claim 2
Dependent Claim
57 words
A laminate, having improved dimensional stability and fire resistance and being preferably applied as a carrier web for roofing sheets, comprising the combination of a preconsolidated synthetic fiber web and a preconsolidated mineral fiber web, which are bonded to each other by needling, wherein the mineral fiber web contains longitudinal reinforcing yarns made of a mineral material.
Claim 3
Dependent Claim
16 words
The laminate as claimed in claim 1, wherein the synthetic fiber web comprises polyethylene terephthalate fibers.
Claim 4
Dependent Claim
24 words
The laminate as claimed in claim 1, wherein the synthetic fiber web is a filament web which has been preconsolidated in a conventional manner.
Claim 5
Dependent Claim
33 words
The laminate as claimed in claim 3, wherein the weight per unit area of the filament web is 50 to 350 g/m 2 coupled with a filament denier of 3 to 8 dtex.
Claim 6
Dependent Claim
18 words
The laminate as claimed in claim 1, wherein the mineral fiber web is a wet-laid staple fiber web.
Claim 7
Dependent Claim
25 words
The laminate as claimed in claim 5, wherein the mineral fiber web has a weight per unit area between 30 and 60 g/m 2 .
Claim 8
Dependent Claim
16 words
Use of the laminate of claim 1 as a carrier web for roofing and sealing webs.
References Cited (Backward Citations)
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Cited
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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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |