US3439807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plant for biological purification of sewage water
Assignee: Individual
•
Filing: 1966-09-09
•
Granted: 1969-04-22
•
Expires: 1986-09-09
Abstract
No abstract record available.
Inventors
- 👤 Martin Danjes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:17
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2334; B01F23/23341; C02F3/22; C02F3/223; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S261/00; Y10S261/75
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA598798A
Cited
US1744785A
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US1900809A
Cited
US2165889A
Cited
GB548664A
Cited
US2530814A
Cited
US2633344A
Cited
US2651615A
Cited
US2963430A
Cited
DE1181673B
Cited
DE1181675B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |