US3980487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticorrosive gypsum composition
Assignee: Nissan Chemical Corp
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Filing: 1975-06-27
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Granted: 1976-09-14
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Expires: 1995-06-27
Abstract
Abstract An anticorrosive gypsum composition is formed from 0.1-10 wt% of a nitrite with gypsum. The gypsum compositions formed from 100 wt. parts of gypsum, 0.1 - 10 wt. parts of a nitrite; 0.1 - 10 wt. parts of a water holding agent and 1 - 300 wt. parts of a filler; are useful for anticorrosive gypsum boards, anticorrosive gypsum plasters and the like.
Inventors
- 👤 Hiroshi Akabayashi
- 👤 Nobuo Akiyama
- 👤 Fumiyoshi Arima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:22
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B24/00; C04B24/12; C04B24/14; C04B2103/00; C04B2103/60; C04B2103/61; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A set plaster composition which consists essentially of 100 wt. parts of calcined gypsum, 0.1 - 10 wt. parts of calcium nitrite or a mixture of calcium nitrite and from 2 to 100% of calcium nitrate relative to the amount of calcium nitrite, 0.05 - 5 wt. parts of methyl cellulose, polyvinylalcohol, polyvinylacetate or a mixture thereof, 0.1 - 6 wt. parts of defatted soybean-hydrolysis product, zinc oxide, sodium phosphate or sodium tripolyphosphate, and 1 - 300 wt. parts of pulp, palaite, diatomaceous earth, bentonite or a mixture thereof.
Claim 2
Dependent Claim
89 words
A set plaster composition which consists essentially of 100 wt. parts of calcined gypsum, 0.1 - 10 wt. parts of calcium nitrite or a mixture of calcium nitrite and from 2 to 100% of calcium nitrate relative to the amount of calcium nitrite, 0.05 - 5 wt. parts of methyl cellulose, polyvinylalcohol, polyvinylacetate or a mixture thereof, 0.1 - 6 wt. parts of defatted soybean-hydrolysis product, zinc oxide, sodium phosphate or sodium tripolyphosphate, and 1 - 300 wt. parts of pulp, palaite, diatomaceous earth, bentonite or a mixture thereof.
Claim 3
Dependent Claim
76 words
A set light-weight plaster composition which consists essentially of 100 wt. parts of calcined gypsum, 0.1 - 10 wt. parts of calcium nitrite or a mixture of calcium nitrite and from 2 to 100% of calcium nitrate relative to the amount of calcium nitrite, 0.05 -5 wt. parts of methyl cellulose, polyvinyl alcohol, polyvinyl acetate or a mixture thereof and, 0.1 - 6 wt. parts of defatted soybean-hydrolysis product, zinc oxide, sodium phosphate or sodium tripolyphosphate.
Claim 4
Dependent Claim
76 words
A set light-weight plaster composition which consists essentially of 100 wt. parts of calcined gypsum, 0.1 - 10 wt. parts of calcium nitrite or a mixture of calcium nitrite and from 2 to 100% of calcium nitrate relative to the amount of calcium nitrite, 0.05 -5 wt. parts of methyl cellulose, polyvinyl alcohol, polyvinyl acetate or a mixture thereof and, 0.1 - 6 wt. parts of defatted soybean-hydrolysis product, zinc oxide, sodium phosphate or sodium tripolyphosphate.
Claim 5
Dependent Claim
83 words
A set gypsum board which consists essentially of 100 wt. parts of calcined gypsum, 0.1 - 10 wt. parts of calcium nitrite or a mixture of calcium nitrite and from 2 to 100% of calcium nitrate relative to the amount of calcium nitrite, 0.1 - 10 wt. parts of dextrin, polyvinyl alcohol, polyvinyl acetate, or a mixture thereof, 0.1 - 6 wt. parts of ammonium sulfate and, 2 - 300 wt. parts of pulp, sand, palaite, bentonite, diatomaceous earth or a mixture thereof.
Claim 6
Dependent Claim
83 words
A set gypsum board which consists essentially of 100 wt. parts of calcined gypsum, 0.1 - 10 wt. parts of calcium nitrite or a mixture of calcium nitrite and from 2 to 100% of calcium nitrate relative to the amount of calcium nitrite, 0.1 - 10 wt. parts of dextrin, polyvinyl alcohol, polyvinyl acetate, or a mixture thereof, 0.1 - 6 wt. parts of ammonium sulfate and, 2 - 300 wt. parts of pulp, sand, palaite, bentonite, diatomaceous earth or a mixture thereof.
Claim 7
Dependent Claim
25 words
The set plaster composition of claim 1 wherein 1 - 100 wt. parts of pulp palaite, diatomaceous earth, bentonite or a mixture thereof, is contained.
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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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |