US3791978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preventing scale and deposit formation in aqueous systems and compositions
Assignee: Joh A Benckiser GmbH
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Filing: 1971-11-17
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Granted: 1974-02-12
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Expires: 1991-11-17
Abstract
Abstract SCALE FORMATION AS WELL AS DEPOSITION OF INCRUSTATIONS IN AQUEOUS SYSTEM ARE PREVENTED BY THE ADDITION OF A COMPOSITION CONTACTING STARCH DEGRADATION PRODUCTS AND PHOSPHORIC ACIDS, PREFERABLY IN SUBSTOICHIOMETRIC AMOUNTS CALCULATED FOR THE SCALE AND HARDNESS CAUSING COMPOUNDS PRESENT IN AQUEOUS SYSTEMS. ACRYLIC ACID AND/OR METHACRYLIC ACID POLYMERS OR COPOLYMERS WITH POLYMERIZABLE ETHYLENICALLY UNSATURATED COMPOUNDS MAY ALSO BE ADDED.
Inventors
- 👤 F Krueger
- 👤 L Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:48
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |