Patent US3487017A successfully refreshed from Google Patents.
US3487017A
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US
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Waste water treatment method and apparatus
Assignee: Aqseptence Group GmbH
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Filing: 1967-05-12
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Granted: 1969-12-30
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Expires: 1987-05-12
Abstract
No abstract record available.
Inventors
- 👤 Ewald Reinhard Thorn
- 👤 Rudolf Christian Passavant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:42
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US313070A
Cited
US1902078A
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US2647869A
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US2678916A
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US2669357A
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US3152982A
Cited
US3300047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |