US2324593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the purification of sewage
Assignee: Individual
•
Filing: 1939-01-30
•
Granted: 1943-07-20
•
Expires: 1959-01-30
Abstract
No abstract record available.
Inventors
- 👤 Persson Alef Ruben
- 👤 Naucler Johan Olof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:48
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; C02F3/205; C02F3/207; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/231; B01F23/23105; B01F23/2312; B01F23/23123; B01F23/232; B01F23/2321; B01F23/23211; B01F23/232111; B01F23/2323; B01F23/23231; B01F23/232312; B01F23/233; B01F23/2334; B01F23/23341; B01F23/237; B01F23/2376; B01F23/23761; B01F27/00; B01F27/80; B01F27/92; B01F27/921; B01F27/9211; B01F23/231231; B01F23/23126; B01F23/231261; B01F23/231266; B01F33/00; B01F33/80; B01F33/81; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-07-19 | 1947-01-18 | 1947-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-07-19 | 1951-01-18 | 1951-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-07-19 | 1955-01-18 | 1955-07-20 | $7700.00 | Window Closed / Lapsed |