US2167225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-purifying apparatus
Assignee: CHESTER M IRWIN
•
Filing: 1936-11-28
•
Granted: 1939-07-25
•
Expires: 1956-11-28
Abstract
No abstract record available.
Inventors
- 👤 William F Van Eweyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:17
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; C02F2307/00; C02F2307/02
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) | 1942-07-24 | 1943-01-23 | 1943-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-07-24 | 1947-01-23 | 1947-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-07-24 | 1951-01-23 | 1951-07-25 | $7700.00 | Window Closed / Lapsed |