US2489012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas circulating separator
Assignee: Carnegie Illinois Steel Corp
•
Filing: 1946-12-28
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Granted: 1949-11-22
•
Expires: 1966-12-28
Abstract
No abstract record available.
Inventors
- 👤 Jr William H Dailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:24
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/663; C21D9/673
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB218602A
Cited
US1870551A
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US1976557A
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US2204889A
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US2250868A
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US2293813A
Cited
US2362823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |