US2233218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water purification system
Assignee: Individual
•
Filing: 1938-08-10
•
Granted: 1941-02-25
•
Expires: 1958-08-10
Abstract
No abstract record available.
Inventors
- 👤 Richard D Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:25
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281; C02F2103/00; C02F2103/42
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) | 1944-02-25 | 1944-08-26 | 1945-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-25 | 1948-08-26 | 1949-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-25 | 1952-08-26 | 1953-02-25 | $7700.00 | Window Closed / Lapsed |