Patent US3421626A successfully refreshed from Google Patents.
US3421626A
Expired / Lapsed
US
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Sewage treatment systems including an aerating reservoir and a post-sedimentation reservoir supplied from said aerating reservoir
Assignee: Individual
•
Filing: 1966-08-17
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Granted: 1969-01-14
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Expires: 1986-08-17
Abstract
No abstract record available.
Inventors
- 👤 Paul Schramm
- 👤 Josef Blanche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:04
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1257; H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/34; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/926
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2089160A
Cited
US2072206A
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US2431640A
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US2798042A
Cited
US2994432A
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US3121680A
Cited
FR1324936A
Cited
GB1025771A
Cited
US3295682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |