US2907124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sludge bed cleaner
Assignee: Individual
•
Filing: 1957-07-22
•
Granted: 1959-10-06
•
Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 Edward S Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:30
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12; C02F11/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2714459A
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US1739624A
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US1773446A
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US1953100A
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US1825956A
Cited
US2041926A
Cited
DE921560C
Cited
US2366480A
Cited
US2534886A
Cited
US2740211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |