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US2492174A
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Solution concentration control system
Assignee: BOIS Co DU
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Filing: 1944-09-29
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Granted: 1949-12-27
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Expires: 1964-09-29
Abstract
No abstract record available.
Inventors
- 👤 William L Wolgemuth
- 👤 Elizabeth A Noble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:55
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1635779A
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US1774457A
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US1967303A
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US1845231A
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FR39690E
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US2215805A
Cited
US2189462A
Cited
US2221306A
Cited
US2312357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |