Patent US2429316A successfully refreshed from Google Patents.
US2429316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for improving clarification of turbid liquids by use of partially thickened sludge
Assignee: Infilco Inc
•
Filing: 1942-10-26
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Granted: 1947-10-21
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Expires: 1962-10-26
Abstract
No abstract record available.
Inventors
- 👤 Walter H Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:41
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281
Claims Analysis
Total Claims: 0
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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) | 1950-10-20 | 1951-04-21 | 1951-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-20 | 1955-04-21 | 1955-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-20 | 1959-04-21 | 1959-10-21 | $7700.00 | Window Closed / Lapsed |