US3575868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flocculating agent comprising starch and polyacrylic acid
Assignee: Zeneca Inc
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Filing: 1968-06-06
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Granted: 1971-04-20
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Expires: 1988-06-06
Abstract
Abstract COMPOSITIONS COMPRISING STARCH AND A POLYACRYLIC ACID ARE DISCLOSED TO BE EFFECTIVE FLOCCULATING AGENTS, ESPECIALLY FOR THE CLARIFICATION OF SODIUM ALUMINATE SOLUTIONS OBTAINED BY THE DIGESTION OF ALUMINIFEROUS ORES WITH CAUSTIC ALKALI SOLUTIONS.
Inventors
- 👤 Thomas J Galvin
- 👤 Francis A Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:11
CPC Classifications
C; C08; C08L; C08L3/00; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/0646; C01F7/0653; C01G; C01G49/00; C01G49/02; C02; C02F; C02F1/00; C02F1/52; C02F1/5263; C02F1/54; C08L33/00; C08L33/02
Claims Analysis
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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 |