US1533778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for purifying water
Assignee: Elliott Co
•
Filing: 1920-09-27
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Granted: 1925-04-14
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Expires: 1940-09-27
Abstract
No abstract record available.
Inventors
- 👤 William H Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:53
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281; C02F1/5236; C02F1/5254; C02F1/001; C02F1/28; C02F1/281; C02F2101/00; C02F2101/10; C02F2101/20; C02F2101/203
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) | 1928-04-13 | 1928-10-13 | 1929-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-04-13 | 1932-10-13 | 1933-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-04-13 | 1936-10-13 | 1937-04-14 | $7700.00 | Window Closed / Lapsed |