Patent US3235489A successfully refreshed from Google Patents.
US3235489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of removing iron from water
Assignee: Johns Manville Corp
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Filing: 1963-06-03
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Granted: 1966-02-15
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Expires: 1983-06-03
Abstract
No abstract record available.
Inventors
- 👤 George R Bell
- 👤 George J Coogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:45
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/58; C02F1/62; C02F1/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF REMOVING CONTAININANTS, AND PARTICULARLY SOLUBLE IRON FROM WATER, COMPRISING, CONTINUOUSLY PRECONDITIONING THE WATER BY ADDING THERETO PRIOR TO FILTRATION BODY FEED CONSISTING ESSENTIALLY OF BETWEEN 10 AND 100 PARTS PER MILLION OF WATER TO BE FILTERED OF PULVERULENT FILTER AID AND BETWEEN 2.5 AND 60 PARTS PER MILLION OF WATER TO BE FILTERED OF A WATER SOLUBLE ALKALI TO PRODUCE A PH OF THE WATER BETWEEN 7 AND 9, SAID ALKALI BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL CARBONATES, ALKALINE EARTH METAL CARBONATES, ALKALINE EARTH METAL HYDRO-
Claim 2
Independent Claim
92 words
A METHOD OF REMOVING CONTAININANTS, AND PARTICULARLY SOLUBLE IRON FROM WATER, COMPRISING, CONTINUOUSLY PRECONDITIONING THE WATER BY ADDING THERETO PRIOR TO FILTRATION BODY FEED CONSISTING ESSENTIALLY OF BETWEEN 10 AND 100 PARTS PER MILLION OF WATER TO BE FILTERED OF PULVERULENT FILTER AID AND BETWEEN 2.5 AND 60 PARTS PER MILLION OF WATER TO BE FILTERED OF A WATER SOLUBLE ALKALI TO PRODUCE A PH OF THE WATER BETWEEN 7 AND 9, SAID ALKALI BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL CARBONATES, ALKALINE EARTH METAL CARBONATES, ALKALINE EARTH METAL HYDRO-
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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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |