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Patent US4504533A successfully refreshed from Google Patents.
US4504533A
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Gypsum construction sheet with glass fiber/non-woven felt lining sheet
Assignee: Knauf Gips KG
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Filing: 1984-05-29
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Granted: 1985-03-12
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Expires: 2004-05-29
Abstract
Abstract The invention concerns a gypsum construction board in which a gypsum core is faced with a two-layer laminate comprised of a nonwoven fiber felt and a glass fiber web of crossed glass fibers wherein the glass fiber web of crossed glass fibers is embedded in the gypsum core and the laminate is in the form of a laminate sheet which extends across the width of the board.
Inventors
- 👤 Herbert Altenhofer
- 👤 Engelbert Wintzheimer
- 👤 Gerhard Neuhauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:03
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/232; Y10T428/237; Y10T428/24; Y10T428/2419; Y10T428/24215; Y10T428/24231; Y10T428/2424; Y10T428/24248; Y10T428/24256; Y10T428/24264; Y10T428/24777; Y10T428/24785; Y10T428/24793
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
122 words
A gypsum construction board comprising a gypsum core formed by application of a water paste like slurry of a mixture of calcined gypsum, water and operational additive on a gypsum-free, dry lower lining sheet folded over upward around longitudinal edges of said core on which is placed a narrower upper gypsum-free, dry lining sheet having margins overlapping the margins of the lower lining sheet, both margins being bonded adhesively and said upper and lower lining being a two-layer laminate of an inner glass fiber web and an outer non-woven fiber felt, said web being embedded in the gypsum core over the width of the board and the glass fiber web of the lower lining sheet being omitted at folded-over sides and edges.
Claim 2
Dependent Claim
122 words
A gypsum construction board comprising a gypsum core formed by application of a water paste like slurry of a mixture of calcined gypsum, water and operational additive on a gypsum-free, dry lower lining sheet folded over upward around longitudinal edges of said core on which is placed a narrower upper gypsum-free, dry lining sheet having margins overlapping the margins of the lower lining sheet, both margins being bonded adhesively and said upper and lower lining being a two-layer laminate of an inner glass fiber web and an outer non-woven fiber felt, said web being embedded in the gypsum core over the width of the board and the glass fiber web of the lower lining sheet being omitted at folded-over sides and edges.
Claim 3
Dependent Claim
25 words
A gypsum construction board according to claim 1, wherein the glass fiber web of the upper lining sheet is omitted at the adhesively bonded margins.
References Cited (Backward Citations)
DE2049603A1
Cited
US3964944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |