Patent US4948647A successfully refreshed from Google Patents.
US4948647A
Expired / Lapsed
US
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Gypsum backer board
Assignee: National Gypsum Properties LLC
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Filing: 1989-02-13
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Granted: 1990-08-14
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Expires: 2009-02-13
Abstract
Abstract A backer board for use as a base to which ceramic tile is bonded for a bathtub or shower area, in which the board is made by forming a gypsum core board with fiber glass laminated composite facings, which include an inner fiber glass scrim, an outer fiber glass nonwoven matte and an acrylic film, which film is formed of an acrylic latex of a class commonly employed as an ingredient in Portland cement mortar for applying ceramic tile.
Inventors
- 👤 Edward A. Burkard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:00
CPC Classifications
B; B32; B32B; B32B13/00; B32B13/14; B32B27/00; B32B27/12; E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; B32B2262/00; B32B2262/10; B32B2262/101; B32B2419/00; B32B2419/04; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/232; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/133; Y10T442/143
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
111 words
A gypsum board, for use in wet areas for application thereto of ceramic tile, said board comprising a set gypsum core, a front face with facing material thereon and a back face with facing material thereon, said facing material on at least said front face being a mineral fiber laminated composite facing, said composite facing including two plies, said two plies consisting of a woven mineral fiber scrim adhered to said gypsum core and a nonwoven mineral fiber matte disposed outward of said scrim, said outwardly disposed matte on said front face having a water based latex-provided film receptive to bonding with resin-enhanced mortars used to apply ceramic tile formed thereon.
Claim 2
Dependent Claim
111 words
A gypsum board, for use in wet areas for application thereto of ceramic tile, said board comprising a set gypsum core, a front face with facing material thereon and a back face with facing material thereon, said facing material on at least said front face being a mineral fiber laminated composite facing, said composite facing including two plies, said two plies consisting of a woven mineral fiber scrim adhered to said gypsum core and a nonwoven mineral fiber matte disposed outward of said scrim, said outwardly disposed matte on said front face having a water based latex-provided film receptive to bonding with resin-enhanced mortars used to apply ceramic tile formed thereon.
Claim 3
Dependent Claim
15 words
A gypsum board as defined in claim 1 wherein said mineral fiber is glass fiber.
Claim 4
Dependent Claim
23 words
A gypsum board as defined in claim 2 wherein said facing material on both said faces is said glass fiber laminated composite facing.
Claim 5
Dependent Claim
48 words
A gypsum board as defined in claim 3 wherein said glass fiber laminated composite facing on said back face extends around side edges on said board and onto said front face whereat said front face laminated composite facing and said back face laminated composite facing form lapped joints.
Claim 6
Dependent Claim
42 words
A gypsum board as defined in claim 4 wherein said back face laminated composite facing includes said two plies only on said back face with only said nonwoven glass fiber matte ply extending around said side edges and onto said front face.
Claim 7
Dependent Claim
20 words
A gypsum board as defined in claim 1 wherein said gypsum core contains a minor percentage of water repellent chemicals.
Claim 8
Dependent Claim
18 words
A gypsum board as defined in claim 1 wherein said outwardly disposed matte has an acrylic film thereon.
Claim 9
Dependent Claim
27 words
A gypsum board as defined in claim 7 wherein said film is formed of a resin which is specifically formulated for use as a Portland cement additive.
Claim 10
Dependent Claim
32 words
A wet area wall structure comprising a gypsum board as defined in claim 1 and a plurality of ceramic tiles adhered to said gypsum board by a layer of resin reinforced mortar.
Claim 11
Dependent Claim
17 words
A wet area wall structure as defined in claim 9 wherein said mineral fiber is glass fiber.
Claim 12
Dependent Claim
22 words
A wet area wall structure as defined in claim 10 wherein said gypsum core contains a minor percentage of water repellent chemicals.
Claim 13
Dependent Claim
25 words
A wet area wall structure as defined in claim 9 wherein said film is a resin similar to said resin of said resin reinforced mortar.
Claim 14
Dependent Claim
16 words
A wet area wall structure as defined in claim 12 wherein said resin is an acrylic.
Claim 15
Independent Claim
124 words
The method of making a gypsum board for use in wet areas comprising the steps of laminating a ply of glass fiber scrim to a ply of a nonwoven glass fiber matte, forming a gypsum slurry containing water repellent additives into board form with said laminated glass fiber composite forming a front face facing for said gypsum board, bonding said glass fiber composite to said gypsum core by causing said gypsum slurry to penetrate into said ply of glass fiber scrim of said glass fiber composite, allowing said gypsum slurry to at least partially set, applying a resin film to a front face of said at least partially set gypsum board, severing said coated gypsum board into predetermined lengths, and drying said gypsum boards.
Claim 16
Independent Claim
124 words
The method of making a gypsum board for use in wet areas comprising the steps of laminating a ply of glass fiber scrim to a ply of a nonwoven glass fiber matte, forming a gypsum slurry containing water repellent additives into board form with said laminated glass fiber composite forming a front face facing for said gypsum board, bonding said glass fiber composite to said gypsum core by causing said gypsum slurry to penetrate into said ply of glass fiber scrim of said glass fiber composite, allowing said gypsum slurry to at least partially set, applying a resin film to a front face of said at least partially set gypsum board, severing said coated gypsum board into predetermined lengths, and drying said gypsum boards.
Claim 17
Dependent Claim
37 words
The method of claim 14 wherein said gypsum board is formed with said laminated glass fiber composite forming the facings of said gypsum board on both a front side and a back side of said gypsum board.
Claim 18
Dependent Claim
60 words
The method of claim 15 wherein said laminated glass fiber composite on said gypsum board back side has side edge portions of solely said nonwoven glass fiber matte, said side edge portions being folded over each side edge of said gypsum core and extending to said front side and adjoined to said laminated glass fiber composite on said front side.
Claim 19
Dependent Claim
22 words
The method of claim 14 wherein said resin film consists of a resin specifically formulated for use as a Portland cement additive.
Claim 20
Dependent Claim
12 words
The method of claim 17 wherein said resin is an acrylic resin.
References Cited (Backward Citations)
US4378405A
Cited
US4504533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |