Patent US3405920A successfully refreshed from Google Patents.
US3405920A
Expired / Lapsed
US
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Process and device for stirring and methodically circulating liquid masses by blowing gases therethrough
Assignee: Individual
•
Filing: 1964-07-30
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Granted: 1968-10-15
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Expires: 1984-07-30
Abstract
No abstract record available.
Inventors
- 👤 Lefrancois Louis Alfre Auguste
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:38
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1278; C02F3/1284; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/232; B01F23/2323; B01F25/00; B01F25/20; B01F25/21; B01F25/50; B01F25/51; B01F33/00; B01F33/40; B01F33/403; C02F3/20; C02F2203/00; C02F2203/006; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US919249A
Cited
US2077445A
Cited
US1988766A
Cited
US3054602A
Cited
US3243169A
Cited
US3218133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-15 | 1972-04-15 | 1972-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-15 | 1976-04-15 | 1976-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-15 | 1980-04-15 | 1980-10-15 | $7700.00 | Window Closed / Lapsed |