Patent US2585808A successfully refreshed from Google Patents.
US2585808A
Expired / Lapsed
US
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Water purification apparatus
Assignee: Individual
•
Filing: 1949-11-25
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Granted: 1952-02-12
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Expires: 1969-11-25
Abstract
No abstract record available.
Inventors
- 👤 Makkonen Osmo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:11
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US748308A
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US1158225A
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FR488433A
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US2129181A
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US2275954A
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US2317847A
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US2382490A
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US2401924A
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US2355564A
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US2391697A
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US2442809A
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US2407947A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |