Patent US20040186479A1 successfully refreshed from Google Patents.
US2409768A
Expired / Lapsed
US
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Liquid level control
Assignee: Blaw Knox Co
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Filing: 1944-12-18
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Granted: 1946-10-22
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Expires: 1964-12-18
Abstract
No abstract record available.
Inventors
- 👤 Charles O Lavett
- 👤 Henry F Kerker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:12
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/04; F; F16; F16K; F16K21/00; F16K21/04; F16K21/18; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/2496; Y10T137/2499; Y10T137/2504; Y10T137/7287; Y10T137/7339
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-10-21 | 1950-04-22 | 1950-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-10-21 | 1954-04-22 | 1954-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-10-21 | 1958-04-22 | 1958-10-22 | $7700.00 | Window Closed / Lapsed |