US3801501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying water
Assignee: Individual
•
Filing: 1972-02-14
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Granted: 1974-04-02
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Expires: 1992-02-14
Abstract
Abstract A METHOD OF PURIFYING WATER IS PROVIDED WHICH IS APPLICABLE TO SEWERAGE OR OTHER POLLUTED WATER TO CONVERT IT TO POTABLE WATER. THE METHOD INVOLVES THE ACIDIFICATION OF THE POLLUTED WATER WITH A MINERAL ACID SUCH AS SULFURIC, NITRIC, HYDROCHLORIC, OR MIXTURES THEREOF, TREATMENT OF THE MIXTURE WITH IRON TO PRODUCE AN IRON SALT IN SITU, FOLLOWED BY NEUTRALIZATION. AN IRON OR ALUMINUM NITRATE OR SULFATE MAY BE ADDED TO THE MIXTURE WHEN IT IS TREATED WITH THE IRON.
Inventors
- 👤 S Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:59
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/66; C02F1/52; C02F1/5236; C02F2303/00; C02F2303/04
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |