US3687859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibiting processes and compositions of aliphatic amines and diquaternary diamines
Assignee: Drew Chemical Corp
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Filing: 1971-02-09
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Granted: 1972-08-29
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Expires: 1991-02-09
Abstract
Abstract IMPROVED COMPOSITIONS ARE DESCRIBED FOR INHIBITING CORROSION IN SYSTEMS USING WATER AS THE HEAT TRANSFER MEDIUM. THE COMPOSITIONS ARE AQUEOUS DISPERSIONS DISPERSIONS COMPRISING AN ALIPHATIC LONG CHAIN AMINE AND FROM ABOUT 0.20 TO ABOUT 1 PART OF N-PHENYL (HIGHER ALKYL) LOWER ALKYL QUATERNARY DIAMINE PER PART OF THE LONG CHAIN ALIPHATIC AMINE. THE PROCESS OF PREPARING THE DISPERSION AND ITS USE TO INHIBIT CORROSION ARE ALSO DISCLOSED.
Inventors
- 👤 Ronald M Silverstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:19
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |