Patent US2841111A successfully refreshed from Google Patents.
US2841111A
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System for controlling liquid level
Assignee: United States Steel Corp
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Filing: 1954-07-28
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Granted: 1958-07-01
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Expires: 1974-07-28
Abstract
No abstract record available.
Inventors
- 👤 Ii Preston L Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:53
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/12; C; C23; C23C; C23C2/00; C23C2/003; C23C2/0036; C23C2/50; C23C2/51; C23C2/52; C23C2/522
Claims Analysis
Total Claims: 0
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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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |