Patent US2250214A successfully refreshed from Google Patents.
US3766077A
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Compositions and method for inhibiting scaling in aqueous systems
Assignee: Chemed Corp
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Filing: 1972-08-16
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Granted: 1973-10-16
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Expires: 1992-08-16
Abstract
Abstract MIXTURES OF LIGNOSULFONIC ACID OR WATER-SOLUBLE LIGNOSULFONATES AND WATER-SOLUBLE ORGANIC POLYMERS CONSISTING OF REPEATED GROUPS WITH THE FORMULA: >C(-)-C(-R)(-COOH)- WHEREIN R IS HYDROGEN OR A METHYL GROUP, OR WATER-SOLUBLE SALTS OR ESTERS OF SUCH POLYMERS INHIBIT THE FORMATION OF ALKALINE EARTH SALT SCALES IN AQUEOUS SYSTEMS.
Inventors
- 👤 C Hwa
- 👤 R Moran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:53
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |