US3575852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating waste water containing dissolved phosphates
Assignee: Amcol International Corp
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Filing: 1969-06-06
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Granted: 1971-04-20
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Expires: 1989-06-06
Abstract
Abstract AN INEXPENSIVE PROCESS FOR REMOVING DISSOLVED PHOSPHATES FROM WASTE WATER BY PRECIPITATING SAME WHICH INCLUDES ADDING TO SAID WASTE WATER A MIXTURE OF LIME AND CATION EXCHANGE MATERIAL A CATION EXCHANGE CAPACITY OF AT LEAST ABOUT 20 MILLIEQUIVALENTS PER 100 GRAMS OF CATION EXCHANGE MATERIAL, THEREBY PRECIPITATING THE SOLUBLE PHOSPHATES AS INSOLUBEL PHOSPHATE SALTS.
Inventors
- 👤 John Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:27
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; B; B01; B01J; B01J39/00; B01J39/02
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |