US4759533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-insulating boards
Assignee: Dresser Industries Inc
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Filing: 1987-01-21
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Granted: 1988-07-26
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Expires: 2007-01-21
Abstract
Abstract A heat-insulating board comprising a molded refractory material having substantially uniformly distributed therethrough flexible thermoset polymer fibers resistant to decomposition at a temperature up to about 400° F. in an amount sufficient to increase the fracture energy of said board, and compositions for making such board.
Inventors
- 👤 Peter T. Sutor
- 👤 Leigh F. Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:37
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0006; F27D1/0009; B; B22; B22D; B22D41/00; B22D41/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
A shaped heat-insulating board comprising a molded refractory material having substantially uniformly distributed therethrough flexible, thermoset polymer fibers resistant to decomposition at a temperature up to about 400° F. in an amount of from about 0.1 to 0.4 parts by weight for each 100 parts by weight of other solids in said board.
Claim 2
Dependent Claim
53 words
A shaped heat-insulating board comprising a molded refractory material having substantially uniformly distributed therethrough flexible, thermoset polymer fibers resistant to decomposition at a temperature up to about 400° F. in an amount of from about 0.1 to 0.4 parts by weight for each 100 parts by weight of other solids in said board.
Claim 3
Dependent Claim
19 words
The board of claim 1, wherein said fibers are polyester fibers from about 1/4 to 1/2 inch in length.
Claim 4
Dependent Claim
13 words
The board of claim 1 or 2, wherein the refractory material is magnesia.
Claim 5
Dependent Claim
61 words
A composition for forming a shaped heat-insulating board for use in molten metal handling vessels comprising a refractory material, a binding resin, and flexible, thermoset polymer fibers resistant to decomposition at a temperature up to about 400° F. in an amount from about 0.1 to 0.4 parts by weight for each 100 parts by weight of other solids in said composition.
Claim 6
Dependent Claim
61 words
A composition for forming a shaped heat-insulating board for use in molten metal handling vessels comprising a refractory material, a binding resin, and flexible, thermoset polymer fibers resistant to decomposition at a temperature up to about 400° F. in an amount from about 0.1 to 0.4 parts by weight for each 100 parts by weight of other solids in said composition.
Claim 7
Dependent Claim
27 words
The composition of claim 4, wherein the refractory material is magnesia, the binding resin is a curable phenolic novolac resin, and the fiber is a polyester fiber.
Claim 8
Dependent Claim
18 words
The composition of claim 5, wherein the polyester fiber is from about 1/4 to 1/2 inch in length.
Claim 9
Dependent Claim
71 words
A composition for forming a shaped heat-insulating board consisting essentially of, for each 100 parts by weight thereof, from about 93 to 96 parts magnesia, about 2.5 to 4 parts curable phenolic novolac resin, about 1 to 1.5 parts filter aid, and about 1 part boric acid, and in addition for each said 100 parts by weight of the foregoing from about 0.1 to 0.4 parts by weight of polyester fiber.
Claim 10
Dependent Claim
71 words
A composition for forming a shaped heat-insulating board consisting essentially of, for each 100 parts by weight thereof, from about 93 to 96 parts magnesia, about 2.5 to 4 parts curable phenolic novolac resin, about 1 to 1.5 parts filter aid, and about 1 part boric acid, and in addition for each said 100 parts by weight of the foregoing from about 0.1 to 0.4 parts by weight of polyester fiber.
References Cited (Backward Citations)
GB1226971A
Cited
US4339115A
Cited
JPS5717473A
Cited
JPS5727978A
Cited
US4440865A
Cited
WO1984000747A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |