Patent US3642641A successfully refreshed from Google Patents.
US3642641A
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Corrosion inhibition
Assignee: Air Products and Chemicals Inc
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Filing: 1968-12-31
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Granted: 1972-02-15
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Expires: 1988-12-31
Abstract
Abstract AQUEOUS ACID SOLUTIONS ARE INHIBITED AGAINST CORROSION OF METALS, ESPECIALLY FERROUS METALS, BY INCORPORATION OF A CORROSION INHIBITING SYSTEM COMPOSED OF A MIXTURE OF A MAJOR AMOUNT OF 3-METHYL-1-BUTYNE-3-O1, AND A MINOR AMOUNT OF N-HEXYNOL, PREFERABLY IN THE PRESENCE OF ETHYLENE DIAMINE OR UREA.
Inventors
- 👤 Robert J Tedeschi
- 👤 Paul W Natali
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:40
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C11; C11D; C11D3/00; C11D3/16; C11D3/164; Y; Y10; Y10S; Y10S507/00; Y10S507/933; Y10S507/934
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |