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Patent US4238239A successfully refreshed from Google Patents.
US4238239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry wall joint and finishing compounds
Assignee: Weston Research Corp
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Filing: 1978-10-25
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Granted: 1980-12-09
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Expires: 1998-10-25
Abstract
Abstract The dry wall joint compound, which can be used to completely close and fill joints between adjoining panel of gypsum dry wall board without a tape material, comprises a powdered mixture of gypsum, hydrated gypsum, calcium carbonate, plaster of paris, hydrated amorphous silica and talc. The dry wall joint compound can be admixed with water to provide a dry wall joint cement and preferably is admixed with a liquid additive composition comprising an aqueous mixture of zinc oxide, sodium acetate, ammonium alum, and an acrylic resin.
Inventors
- 👤 William F. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:52
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/00474; C04B2111/00663; C04B2111/00672
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A method for preparing a joint cement which can be applied to completely fill the joint between adjoining panels of dry wall board without a tape material comprising the steps of admixing a sufficient quantity of (a) a liquid additive composition comprising an aqueous mixture containing about 0.35 to about 8 weight % zinc oxide, about 0.35 to about 1.5 weight % sodium acetate, about 0.35 to about 3 weight % ammonium alum, and about 0.35 to about 8 weight % of an acrylic resin, all based on the total weight of the aqueous mixture, with (b) a wall board joint compound comprising a powdered mixture of about 27 to about 41 weight % gypsum, about 24 to about 38 weight % hydrated gypsum, about 16 to about 26 weight % calcium carbonate, about 5 to about 9 weight % plaster of paris, about 4 to about 6 weight % hydrated amorphous silica, and about 1 to about 3 weight % talc to provide a spreadable product.
Claim 2
Independent Claim
167 words
A method for preparing a joint cement which can be applied to completely fill the joint between adjoining panels of dry wall board without a tape material comprising the steps of admixing a sufficient quantity of (a) a liquid additive composition comprising an aqueous mixture containing about 0.35 to about 8 weight % zinc oxide, about 0.35 to about 1.5 weight % sodium acetate, about 0.35 to about 3 weight % ammonium alum, and about 0.35 to about 8 weight % of an acrylic resin, all based on the total weight of the aqueous mixture, with (b) a wall board joint compound comprising a powdered mixture of about 27 to about 41 weight % gypsum, about 24 to about 38 weight % hydrated gypsum, about 16 to about 26 weight % calcium carbonate, about 5 to about 9 weight % plaster of paris, about 4 to about 6 weight % hydrated amorphous silica, and about 1 to about 3 weight % talc to provide a spreadable product.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein the weight ratio of (a) to (b) is about 0.5:1 to about 6:1.
Claim 4
Dependent Claim
38 words
A method according to claim 1 wherein said liquid additive composition contains about 0.7 weight % zinc oxide, about 0.7 weight % sodium acetate, about 0.7 weight % ammonium alum, and about 0.7 weight % of acrylic resin.
Claim 5
Dependent Claim
59 words
A method according to claim 3 wherein said wall board joint compound contains about 34 weight % gypsum, about 31 weight % hydrated gypsum, about 21 weight % calcium carbonate, about 7 weight % plaster of paris, about 5 weight % hydrated amorphous silica and about 3 weight % talc, all based on the total weight of said mixture.
Claim 6
Independent Claim
102 words
A method for preparing a joint cement for wall board comprising the steps of admixing a sufficient quantity of (a) a gypsum-based dry wall joint filler containing about 5 to about 15 weight % of lithium mica with (b) a liquid additive composition comprising an aqueous mixture containing about 0.35 to about 8 weight % zinc oxide, about 0.35 to about 1.5 weight % sodium acetate, about 0.35 to about 3 weight % ammonium alum, and about 0.35 to about 8 weight % of an acrylic resin, all based on the total weight of the aqueous mixture, to provide a spreadable product.
Claim 7
Independent Claim
102 words
A method for preparing a joint cement for wall board comprising the steps of admixing a sufficient quantity of (a) a gypsum-based dry wall joint filler containing about 5 to about 15 weight % of lithium mica with (b) a liquid additive composition comprising an aqueous mixture containing about 0.35 to about 8 weight % zinc oxide, about 0.35 to about 1.5 weight % sodium acetate, about 0.35 to about 3 weight % ammonium alum, and about 0.35 to about 8 weight % of an acrylic resin, all based on the total weight of the aqueous mixture, to provide a spreadable product.
Claim 8
Dependent Claim
49 words
A method according to claim 5 wherein said joint filler contains about 8 weight % lithium mica and said liquid additive composition contains about 0.7 weight % zinc oxide, about 0.7 weight % sodium acetate, about 0.7 weight % ammonium alum, and about 0.7 weight % of acrylic resin.
References Cited (Backward Citations)
US3256223A
Cited
US3947398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |