US3649533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement for purifying water drawn from a ground-water well
Assignee: Four Seasons Venture Capital AB
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Filing: 1970-02-04
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Granted: 1972-03-14
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Expires: 1990-02-04
Abstract
Abstract THE PRESENT INVENTION CONCERNS A METHOD FOR PURIFYING WATER DRAWN FROM A GROUND-WATER WELL, MOST SUITABLY FROM A DEEP WELL, FROM IRON BY INTRODUCING IN THE WATER OXYGEN OR AN OXYGEN-RELEASING SUBSTANCE AND BY FILTERING TO REMOVE THE IRON OXIDE WHICH IS PRECIPITATED. THE METHOD IS CHARACTERIZED IN THAT INTO THE GROUND WATER-CARRYING SOIL LAYER SURROUNDING THE WELL FEED WATER IS FED WHICH CONTAINS OXYGEN OR AN OXYGEN-RELEASING SUBSTANCE.
Inventors
- 👤 Yrjo Johannes Reijonen
- 👤 Veli Elias Reijonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:23
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/58; C02F1/62; C02F1/64; C02F1/645; C02F2103/00; C02F2103/06
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |