US2574685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment system
Assignee: Individual
•
Filing: 1946-09-21
•
Granted: 1951-11-13
•
Expires: 1966-09-21
Abstract
No abstract record available.
Inventors
- 👤 Robert R Baxter
- 👤 Martin A Milling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:55
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB105654A
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DE506337C
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US1139024A
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US2388795A
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US2415048A
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US2419492A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |