US2029958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of organically polluted waters
Assignee: CHARLES H LEWIS
•
Filing: 1933-08-28
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Granted: 1936-02-04
•
Expires: 1953-08-28
Abstract
No abstract record available.
Inventors
- 👤 Oliver M Urbain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:43
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/725
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-02-03 | 1939-08-05 | 1940-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-02-03 | 1943-08-05 | 1944-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-02-03 | 1947-08-05 | 1948-02-04 | $7700.00 | Window Closed / Lapsed |