US3617577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting scale formation
Assignee: Monsanto Co
•
Filing: 1969-08-27
•
Granted: 1971-11-02
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Expires: 1989-08-27
Abstract
Abstract Precipitation of scale-forming alkaline earth salts in aqueous systems is inhibited by maintaining threshold concentrations of ethylene-maleic acid copolymers having molecular weights of from about 1,000 to 5,000 in the system.
Inventors
- 👤 Thomas M King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:07
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
21 words
The method of claim 1 wherein said threshold concentration is provided by the addition of ethylene-maleic anhydride copolymer to said system.
References Cited (Backward Citations)
US2723956A
Cited
US3336221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |