Patent US3087340A successfully refreshed from Google Patents.
Patent US2854992A successfully refreshed from Google Patents.
US2854992A
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Flow control apparatus for reaction columns and the like
Assignee: Individual
•
Filing: 1956-04-27
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Granted: 1958-10-07
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Expires: 1976-04-27
Abstract
No abstract record available.
Inventors
- 👤 Clifford A Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01D; B01D15/00; B01D15/08; B01D15/10; B01D15/16; B01D15/163; B01D3/00; B01D3/42; G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/32; G01N2030/324; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3021; Y10T137/7287; Y10T137/7313
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US179863A
Cited
US2693801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |