US3013780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-liquid contacting apparatus with shutter trays
Assignee: Shell USA Inc
•
Filing: 1957-12-09
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Granted: 1961-12-19
•
Expires: 1977-12-09
Abstract
No abstract record available.
Inventors
- 👤 Harry A Wistrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:56
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/70; B01F25/74; B01F25/741; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01F23/00; B01F23/20; B01F23/23; B01F23/232; B01F23/2321; B01F23/2322; B01F2025/91; B01F2025/918; B01F27/00; B01F27/05; B01F27/11; B01F27/19; B01F27/191
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US940947A
Cited
GB404261A
Cited
US2265762A
Cited
US2672406A
Cited
US2745372A
Cited
US2838362A
Cited
US2793847A
Cited
US2831666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |