US2661333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purification of water
Assignee: MERKANTILA INGENIORSBYRAN PEHR
•
Filing: 1949-04-29
•
Granted: 1953-12-01
•
Expires: 1969-04-29
Abstract
No abstract record available.
Inventors
- 👤 Schein Harry Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:11
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1324118A
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US1211481A
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GB191419722A
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GB191510705A
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US1413153A
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GB286338A
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GB292099A
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US1750561A
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US1890969A
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US2272223A
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US2400439A
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US2452928A
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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) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |