US2953306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersing gas in a confined liquid
Assignee: Shell USA Inc
•
Filing: 1954-12-22
•
Granted: 1960-09-20
•
Expires: 1974-12-22
Abstract
No abstract record available.
Inventors
- 👤 Dijkstra Christiaan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:42
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/232
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US399200A
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US524888A
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US1001557A
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US1740441A
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US1853045A
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US1999116A
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US2020850A
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DE609508C
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US2012623A
Cited
GB467359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |