US3715307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of water used in heat transfer equipment
Assignee: Ecolab Inc
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Filing: 1971-06-24
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Granted: 1973-02-06
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Expires: 1991-06-24
Abstract
Abstract MALEIC ANHYDRIDE COPOLYMERS (E.G., COPOLYMERIZED WITH VINYL ACETATE) ARE USED IN ADDITIVE AMOUNTS IN WATER (E.G., SEA WATER) TO REDUCE MAINTENANCE PROBLEMS ASSOCIATED WITH THE USE OF SUCH WATER IN HEAT TRANSFER EQUIPMENT (E.G., EVAPORATORS).
Inventors
- 👤 D Johnson
- 👤 W Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:27
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; Y; Y10; Y10S; Y10S159/00; Y10S159/13
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |