Patent US4739391A successfully refreshed from Google Patents.
Patent US3669612A successfully refreshed from Google Patents.
US3669612A
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Use of cyclic amidine polymers as corrosion inhibitors
Assignee: Baker Petrolite LLC
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Filing: 1970-05-15
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Granted: 1972-06-13
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Expires: 1990-05-15
Abstract
Abstract THE USE OF CYCLIC AMIDINE POLYMERS AS CORROSION INHIBITORS. THESE POLYMERS ARE FORMED (1) BY REACTING CYANOHYDRINS WITH (2) CYCLIC AMIDINE-FORMING POLYAMINES TO FORM POLYAMINONITRILES; AND BY FURTHER REACTING THESE POLYAMINONITRILES INTERMOLECULARLY OR WITH A POLYAMINE UNDER CYCLIC AMIDINE-FORMING CONDITIONS TO FORM THE POLYMERS.
Inventors
- 👤 Robert R Annand
- 👤 Derek Redmore
- 👤 Brian M Rushton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:52
CPC Classifications
C; C07; C07C; C07C255/00; C02; C02F; C02F1/00; C02F1/50; C02F1/52; C08; C08G; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616; C10; C10G; C10G33/00; C10G33/04; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |