Patent US2631836A successfully refreshed from Google Patents.
US2631836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory lining
Assignee: United States Steel Corp
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Filing: 1948-10-15
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Granted: 1953-03-17
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Expires: 1968-10-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Willis
Bibliographic Details
Application Number
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Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:02
CPC Classifications
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Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A GAS PORT FOR A SOAKING PIT OR THE LIKE COMPRISING A LAYER OF REFRACTORY BRICK FORMING THE INNER LINGING OF THE PORT, AN OUTER FERROUS METAL SHIELD ENTIRELY SURROUNDING THE PERIPHERY OF THE LINING AT THE EXIT END OF THE PORT, AND A LAYER OF CHROME ORE REFRACTORY BETWEEN THE REFRACTORY FORMING A SEPARATING LAYER AND THE SHIELD, THE FERROUS SHIELD BEING FUSED WITH THE CHROME ORE REFRACTORY.
Claim 2
Dependent Claim
69 words
A GAS PORT FOR A SOAKING PIT OR THE LIKE COMPRISING A LAYER OF REFRACTORY BRICK FORMING THE INNER LINGING OF THE PORT, AN OUTER FERROUS METAL SHIELD ENTIRELY SURROUNDING THE PERIPHERY OF THE LINING AT THE EXIT END OF THE PORT, AND A LAYER OF CHROME ORE REFRACTORY BETWEEN THE REFRACTORY FORMING A SEPARATING LAYER AND THE SHIELD, THE FERROUS SHIELD BEING FUSED WITH THE CHROME ORE REFRACTORY.
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US1970209A
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US2052187A
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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) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |