US3751372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale and corrosion control in circulating water using polyphosphates and organophonic acids
Assignee: Calgon Corp
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Filing: 1971-06-18
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Granted: 1973-08-07
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Expires: 1991-06-18
Abstract
Abstract PROVIDES A COMPOSITION AND METHOD FOR CONDITIONING CIRCULATING WATER TO REDUCE CORROSION AND/OR SCALE ACCUMULATION ON METAL. THE COMPOSITION INCLUDES (1) CERTAIN WATER SOLUBLE IN ORGANIC POLYPHOSPHATES OR THEIR CORRESPONDING ACIDS OR (2) PHOSPHORYLATED POLYOLS TOGETHER WITH (3) CERTAIN WATER SOLUBLE ORGANOPHOSPHONIC ACIDS OR THEIR CORRESPONDING SALTS. COMPONENT (3) SYNERGISTICALLY INCREASES THE EFFICIENCY OF COMPONENTS (1) AND (2). THE METHOD INCLUDES INTRODUCING THE COMPONENTS INTO THE WATER PERIODICALLY, BUT PREFERABLY CONTINUOUSLY, EITHER SEPARATELY OR IN COMBINATION.
Inventors
- 👤 D Zecher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:24
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C02F5/145
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |