Patent US2686211A successfully refreshed from Google Patents.
US2686211A
Expired / Lapsed
US
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Combustion furnace
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1952-07-12
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Granted: 1954-08-10
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Expires: 1972-07-12
Abstract
No abstract record available.
Inventors
- 👤 Alexander B Cargill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:54
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1571742A
Cited
US2041333A
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US2214976A
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US2332943A
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US2322618A
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US2362687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |