US2904835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sludge deliquefying-compacting press
Assignee: Ethyl Corp
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Filing: 1956-12-10
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Granted: 1959-09-22
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Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Henry A Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:09
CPC Classifications
B; B30; B30B; B30B9/00; B30B9/02; B30B9/04; B30B9/042; C; C22; C22B; C22B13/00; C22B13/06
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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |