US4897294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating material containing delaminated vermiculite
Assignee: Alcoa Corp
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Filing: 1988-09-12
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Granted: 1990-01-30
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Expires: 2008-09-12
Abstract
Abstract An asbestos-free insulating material suitable for use as a header in molten metal casting. The material is made from a dry mixture comprising lime, siliceous component, delaminated vermiculite or spodumene or lithium aluminate or mixtures thereof, and optionally, wollastonite and organic fiber. The dry mixture is mixed with water to form a slurry, shaped, heated in the presence of steam, and dried to remove free water.
Inventors
- 👤 Stephen C. Libby
- 👤 G. Edward Graddy, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:37
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/04; B22D11/059; B22D11/0401; Y; Y10; Y10T; Y10T428/00; Y10T428/13
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
An insulating material suitable for use as a header in continuous molten metal casting and comprising about: (a) 15-40 wt % lime; (b) 15-40 wt % siliceous component; (c) 10-70 wt % delaminated vermiculite or spodumene or lithium aluminate or mixtures thereof; (d) 0-55 wt % wollastonite; and (e) 0-10 wt % organic fiber.
Claim 2
Dependent Claim
54 words
An insulating material suitable for use as a header in continuous molten metal casting and comprising about: (a) 15-40 wt % lime; (b) 15-40 wt % siliceous component; (c) 10-70 wt % delaminated vermiculite or spodumene or lithium aluminate or mixtures thereof; (d) 0-55 wt % wollastonite; and (e) 0-10 wt % organic fiber.
Claim 3
Dependent Claim
39 words
An insulating material as claimed in claim 1 comprising about: (a) 15-35 wt % lime; (b) 15-35 wt % siliceous component; (c) 12-25 wt % delaminated vermiculite; (d) 15-50 wt % wollastonite; and (e) 1-10 wt % organic fiber.
Claim 4
Dependent Claim
39 words
An insulating material as claimed in claim 1 comprising about: (a) 15-25 wt % lime; (b) 15-25 wt % siliceous component; (c) 12-20 wt % delaminated vermiculite; (d) 30-50 wt % wollastonite; and (e) 1-8 wt % organic fiber.
Claim 5
Dependent Claim
14 words
An insulating material as claimed in claim 1 wherein said material is substantially asbestos-free.
Claim 6
Dependent Claim
64 words
An insulating material as claimed in claim 1 wherein said material is made by mixing lime, the siliceous component, delaminated vermiculite, wollastonite, and organic fiber with water to form an aqueous slurry; molding the aqueous slurry into a wet shape; expelling water from the wet shape; heating the wet shape in the presence of steam; and drying the wet shape to remove free water.
Claim 7
Dependent Claim
18 words
An insulating material as claimed in claim 5 wherein said material has a matrix comprising calcium silicate hydrate.
Claim 8
Dependent Claim
17 words
An insulating material as claimed in claim 5 wherein said material has a matrix comprising predominantly tobermorite.
Claim 9
Dependent Claim
44 words
An asbestos-free insulating material consisting essentially of about: (a) 15-40 wt % lime; (b) 15-40 wt % silica; (c) 10-70 wt % delaminated vermiculite or spodumene or lithium aluminate or mixtures thereof; (d) 0-55 wt % wollastonite; and (e) 1-8 wt % organic fiber.
Claim 10
Dependent Claim
44 words
An asbestos-free insulating material consisting essentially of about: (a) 15-40 wt % lime; (b) 15-40 wt % silica; (c) 10-70 wt % delaminated vermiculite or spodumene or lithium aluminate or mixtures thereof; (d) 0-55 wt % wollastonite; and (e) 1-8 wt % organic fiber.
Claim 11
Dependent Claim
66 words
An insulating material as claimed in claim 8 wherein said insulating material is made by mixing lime, silica, delaminated vermiculite, wollastonite, and organic fiber with water to form an aqueous slurry; molding the aqueous slurry into a wet shape; expelling water from the wet shape; heating the wet shape above 100° C. in the presence of steam; and drying the wet shape to remove free water.
Claim 12
Dependent Claim
90 words
An asbestos-free insulation material made by the steps of: (a) mixing a dry mixture comprising about 15-25 wt % lime, about 15-25 wt % silica, about 12-20 wt % delaminated vermiculite, about 30-50 wt % wollastonite, and about 1-8 wt % organic fiber with water to form an aqueous slurry; (b) molding the aqueous slurry into a wet shape; (c) expelling water from the wet shape; (d) heating the wet shape above about 100° C. in the presence of steam; and (e) drying the wet shape to remove free water.
Claim 13
Dependent Claim
90 words
An asbestos-free insulation material made by the steps of: (a) mixing a dry mixture comprising about 15-25 wt % lime, about 15-25 wt % silica, about 12-20 wt % delaminated vermiculite, about 30-50 wt % wollastonite, and about 1-8 wt % organic fiber with water to form an aqueous slurry; (b) molding the aqueous slurry into a wet shape; (c) expelling water from the wet shape; (d) heating the wet shape above about 100° C. in the presence of steam; and (e) drying the wet shape to remove free water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |