US3876451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activated carbon and the method of making it
Assignee: Individual
•
Filing: 1971-08-24
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Granted: 1975-04-08
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Expires: 1991-08-24
Abstract
Abstract An activated carbon for the removal of phosphate from waste effluents and the process of producing it is disclosed. The activation of the carbon is accomplished by the introduction of cations, such as aluminum, manganese, zinc, iron, lithium or calcium, into the carbon structure which have the ability to react with the phosphates in the waste effluents and thereby fix the phosphates in the carbon material.
Inventors
- 👤 David M Zall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:14
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/283; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; C01B32/348; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A PROCESS FOR TREATING CARBON TO ENABLE IT TO REMOVE PHOSPHATES FROM WASTE EFFLUENTS, WHICH COMPRISES THE STEPS OF: FIRST, SATURATING THE CARBON WITH A METALLIC CHLORIDE SOLUTION SELECTED FROM THE GROUP CONSISTING OF ALUMINUM CHLORIDE, ZINC CHLORIDE, MANGANESE CHLORIDE, MAGNESIUM CHLORIDE, CALCIUM CHLORIDE, AND IRON CHLORIDE; DRYING SAID SATURATED CARBON TO FIX THE CHLORIDE ON THE CARBON STRUCTURE; TREATING THE CARBON WITH A SOLUTION OF ALKALI HYDROXIDE TO FORM A METAL HYDROXIDE DEPOSIT WHICH WILL REACT WITH PHOSPHATES IN THE WASTE EFFLUENTS FOR FORM A WATER INSOLUBLE PHOSPHATE.
Claim 2
Dependent Claim
89 words
A PROCESS FOR TREATING CARBON TO ENABLE IT TO REMOVE PHOSPHATES FROM WASTE EFFLUENTS, WHICH COMPRISES THE STEPS OF: FIRST, SATURATING THE CARBON WITH A METALLIC CHLORIDE SOLUTION SELECTED FROM THE GROUP CONSISTING OF ALUMINUM CHLORIDE, ZINC CHLORIDE, MANGANESE CHLORIDE, MAGNESIUM CHLORIDE, CALCIUM CHLORIDE, AND IRON CHLORIDE; DRYING SAID SATURATED CARBON TO FIX THE CHLORIDE ON THE CARBON STRUCTURE; TREATING THE CARBON WITH A SOLUTION OF ALKALI HYDROXIDE TO FORM A METAL HYDROXIDE DEPOSIT WHICH WILL REACT WITH PHOSPHATES IN THE WASTE EFFLUENTS FOR FORM A WATER INSOLUBLE PHOSPHATE.
Claim 3
Dependent Claim
13 words
The process as in claim 1 wherein said alkali hydroxide is sodium hydroxide.
Claim 4
Dependent Claim
74 words
An activated carbon for removing phosphates from waste effluents comprising: a carbon structure; a deposit within said carbon structure of a metallic cation producing compound selected from the group consisting of oxy-salts or oxides or hydroxides of aluminum, manganese, magnesium, zinc, iron, calcium and lithium whereby the soluble phosphates will combine with the cations deposited on the carbon to form a water insoluble phosphate retained on the carbon, when the activated carbon is used.
Claim 5
Dependent Claim
74 words
An activated carbon for removing phosphates from waste effluents comprising: a carbon structure; a deposit within said carbon structure of a metallic cation producing compound selected from the group consisting of oxy-salts or oxides or hydroxides of aluminum, manganese, magnesium, zinc, iron, calcium and lithium whereby the soluble phosphates will combine with the cations deposited on the carbon to form a water insoluble phosphate retained on the carbon, when the activated carbon is used.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |