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Patent US3998769A successfully refreshed from Google Patents.
US3998769A
Expired / Lapsed
US
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Mica, free, crack-resistant drying type joint compound
Assignee: United States Gypsum Co
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Filing: 1975-12-24
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Granted: 1976-12-21
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Expires: 1995-12-24
Abstract
Abstract A drying type crack-resistant joint compound comprising terra alba and a binder, the compound being characterized in that it is essentially free of mica.
Inventors
- 👤 Marvin K. Lane
- 👤 Winton C. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:40
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A crack-resistant, drying type joint compound adapted for use in finishing joints between wallboards when mixed with water, comprising a mixture of terra alba in an amount from about 80% to about 95% of the weight of the total composition, a thickener, and a binder, in an amount from about 2% to about 10% of the weight of the total composition, said terra alba being characterized by a size distribution sufficient to prevent cracking without the addition of mica, whereby said joint compound is essentially free of mica.
Claim 2
Dependent Claim
88 words
A crack-resistant, drying type joint compound adapted for use in finishing joints between wallboards when mixed with water, comprising a mixture of terra alba in an amount from about 80% to about 95% of the weight of the total composition, a thickener, and a binder, in an amount from about 2% to about 10% of the weight of the total composition, said terra alba being characterized by a size distribution sufficient to prevent cracking without the addition of mica, whereby said joint compound is essentially free of mica.
Claim 3
Dependent Claim
50 words
The joint compound as defined in claim 1, wherein said terra alba has a size distribution characterized in that the mean-particle size is at least about 14 microns and the weight percent of particles smaller than 1 micron does not exceed about 2% of the weight of the terra alba.
Claim 4
Dependent Claim
14 words
The joint compound as defined in claim 1, wherein said binder is polyvinyl acetate.
Claim 5
Dependent Claim
28 words
The joint compound as defined in claim 1, wherein said binder is starch mixed with a polymer selected from the group consisting of polyvinyl acetate and polyvinyl alcohol.
Claim 6
Dependent Claim
22 words
A ready-mixed joint compound comprising the joint compound as defined in claim 1, and enough water to give it a paste-like consistency.
References Cited (Backward Citations)
US3003979A
Cited
US3297601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |