US3751195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-treating-furnace roll and method of heat-treating metal strip therewith
Assignee: PITTSBURGH STEEL CORP
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Filing: 1971-08-18
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Granted: 1973-08-07
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Expires: 1991-08-18
Abstract
Abstract Roll of the invention includes a roll body of metal and a sleeve, made up of fused silica particles sinter bonded with colloidal silica or cement, or a mixture of fused silica particles and particles of other oxides sinter bonded with colloidal silica or cement, or sinter bonded fireclay granules, fixedly surrounding the roll body. Method of the invention consists of the steps of supporting strip which is being heattreating at a temperature above 1000*F by a surface consisting of sintered fused silica particles, sintered fused silica mixed with other oxide particles, or sintered fireclay granules to inhibit formation of accretions on the supporting surface.
Inventors
- 👤 R Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:15
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/02; F27D3/026
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
29 words
The heat treatment of metal strip according to claim 1 in which said strip is supported during the heat treatment by a surface consisting of sinter bonded fused silica.
Claim 2
Dependent Claim
53 words
The heat treatment of metal strip according to claim 1 in which said strip is supported during the heat treatment by a surface consisting of sinter bonded fused silica having a content of up to 20 percent of at least one of the group consisting of fireclay, CaO, MgO, Al2O3, ZrSiO4, and Cr2O3.
Claim 3
Dependent Claim
96 words
The heat treatment of metal strip according to claim 1 in which said strip is supported during the heat treaTment by a surface consisting of granular fireclay sinter bonded with a cold set binder. 5. A roll for supporting objects at elevated temperatures comprising a roll body, porous sleeve surrounding said roll body, said sleeve being composed of one of the group consisting of sinter bonded fused silica; sinter bonded fused silica having a content of up to 20 percent of at least one of the group consisting of fireclay, CaD, MgO, A12O3, ZrSiO4, and Cr2O3.
Claim 4
Dependent Claim
27 words
A roll according to claim 5 in which said sleeve has a maximum thermal coefficient of expansion from 0* to 1800*F of approximately 0.5 X 10 6.
Claim 5
Dependent Claim
27 words
A roll according to claim 5 in which said sleeve has a maximum thermal coefficient of expansion from 0* to 1800*F of approximately 0.3 X 10 6.
Claim 6
Dependent Claim
23 words
A roll according to claim 5 in which said sleeve consists substantially of fused silica fines sinter bonded with a colloidal silica binder.
Claim 7
Dependent Claim
22 words
A roll according to claim 5 in which said sleeve consists substantially of fused silica fines sinter bonded with a cement binder.
Claim 8
Dependent Claim
50 words
A roll according to claim 5 in which said sleeve consists substantially of a mixture of fused silica fines and up to 20 percent of at least one of the group consisting of fireclay, CaO, MgO, A12O3, ZrSiO4, and Cr2O3, said mixture being sinter bonded with a colloidal silica binder.
Claim 9
Dependent Claim
49 words
A roll according to claim 5 in which said sleeve consists substantially of a mixture of fused silica fines and up to 20 percent of at least one of the group consisting of fireclay, CaO, MgO, A1203, ZrSiO4, and Cr2O3, said mixture being sinter bonded with a cement binder.
Claim 10
Dependent Claim
34 words
A roll for supporting objects at elevated temperatures comprising a roll body, a porous sleeve surrounding said roll body, said sleeve being composed substantially of granular fireclay sinter bonded with a cold set binder.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |