Patent US1573386A successfully refreshed from Google Patents.
Patent US3524547A successfully refreshed from Google Patents.
US3524547A
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US
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Apparatus for the treatment of sewage and like industrial waste
Assignee: Drysdale and Co Ltd
•
Filing: 1969-01-27
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Granted: 1970-08-18
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Expires: 1989-01-27
Abstract
No abstract record available.
Inventors
- 👤 James B Nicol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:39
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F1/00; C02F1/006; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2154132A
Cited
US2243826A
Cited
US2144386A
Cited
US3355019A
Cited
US3342727A
Cited
US3382981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |