Patent US2658737A successfully refreshed from Google Patents.
US2658737A
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Means for flow control in bubble towers
Assignee: Individual
•
Filing: 1950-03-10
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Granted: 1953-11-10
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Expires: 1970-03-10
Abstract
No abstract record available.
Inventors
- 👤 Irvin E Nutter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:20
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/163; F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/026; F16K15/06; F16K15/063; F16K15/065; F16K2200/00; F16K2200/20; F16K2200/203; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7924; Y10T137/7929; Y10T137/7931; Y10T137/7932; Y10T137/7933
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR619029A
Cited
US1880525A
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US2061830A
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US2045518A
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US2105501A
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US2218993A
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US2205284A
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US2428889A
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US2525064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |