US2818388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition
Assignee: Stepan Co
•
Filing: 1954-01-04
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Granted: 1957-12-31
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Expires: 1974-01-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Vincent A Sullivan
- 👤 Smedslund Tor Halfdan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:28
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
19 words
DIMETHYL SULFOXIDE HAVING DISSOLVED THEREIN GUANIDINE CARBONATE AND ETHYLENE DIAMINE, EACH IN A CONCENTRATION OF 0.01-0.05 MOL PER LITER.
References Cited (Backward Citations)
US1981109A
Cited
US2043257A
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US2581050A
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US2499822A
Cited
US2602779A
Cited
US2658038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |