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Patent US4038069A successfully refreshed from Google Patents.
US4038069A
Expired / Lapsed
US
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Heat-insulating agent for molten metal
Assignee: Aikoh Co Ltd
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Filing: 1976-01-26
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Granted: 1977-07-26
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Expires: 1996-01-26
Abstract
Abstract A heat-insulating agent for molten metal comprising a burned material obtained by light-burning a dehydrate of sludge discharged in pulping/or paper-making procedures and a method of insulating a molten metal from loss of heat comprising covering the surface of the molten metal with a layer of the heat-insulating agent.
Inventors
- 👤 Masaru Takashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:57
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/04; B22D27/06; B22D11/00; B22D11/10; B22D11/11; B22D11/111; C; C04; C04B; C04B18/00; C04B18/04; C04B18/06; C04B18/10; C21; C21C; C21C7/00; C21C7/04; C21C7/076; C22; C22B; C22B9/00; C22B9/10; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A heat-insulating agent for molten metal which comprises a burned material containing about 5 to 30% by weight carbon which is obtained by light-burning a dehydrate of sludge discharged in pulping or paper-making procedures, said sludge containing pulp fibers, lignin and chemicals conventionally employed in pulping processes, said dehydrate containing about 60 to 90% by weight water and about 10 to 40% by weights solids, said solids including about 40 to 80% by weight organic material and about 20 to 60% by weight ash.
Claim 2
Dependent Claim
84 words
A heat-insulating agent for molten metal which comprises a burned material containing about 5 to 30% by weight carbon which is obtained by light-burning a dehydrate of sludge discharged in pulping or paper-making procedures, said sludge containing pulp fibers, lignin and chemicals conventionally employed in pulping processes, said dehydrate containing about 60 to 90% by weight water and about 10 to 40% by weights solids, said solids including about 40 to 80% by weight organic material and about 20 to 60% by weight ash.
Claim 3
Dependent Claim
22 words
The heat-insulating agent according to claim 1, wherein the burned material has a bulk density of not higher than about 0.5 g/cc.
Claim 4
Dependent Claim
22 words
The heat-insulating agent according to claim 1, wherein the burned material has a particle size of not larger than about 20 mm.
Claim 5
Dependent Claim
22 words
The heat-insulating agent according to claim 2, wherein the burned material has a particle size of not larger than about 20 mm.
Claim 6
Dependent Claim
29 words
A method of insulating a molten metal from loss of heat comprising covering the surface of the molten metal with a layer of the heat-insulating agent of claim 1.
References Cited (Backward Citations)
US2092595A
Cited
US3704230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |