Patent US3470091A successfully refreshed from Google Patents.
US3470091A
Expired / Lapsed
US
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Treatment of polluted streams in place
Assignee: Dorr Oliver Inc
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Filing: 1968-02-08
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Granted: 1969-09-30
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Expires: 1988-02-08
Abstract
No abstract record available.
Inventors
- 👤 William E Budd
- 👤 Thomas J Powers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:20
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1215; C02F7/00; C02F1/00; C02F1/52; C02F11/00; C02F11/12; C02F2103/00; C02F2103/007; C02F2203/00; C02F2203/008; C02F2307/00; C02F2307/08; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |