US2630368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase inhibitors of corrosion
Assignee: Shell Development Co
•
Filing: 1946-06-01
•
Granted: 1953-03-03
•
Expires: 1966-06-01
Abstract
No abstract record available.
Inventors
- 👤 Wachter Aaron
- 👤 Stillman Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:57
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
IN A METHOD OF INHIBITING CORROSION OF A FERROUS METAL NORMALLY CORRODIBLE BY CONTACT WITH VAPOR AND OXYGEN, THE STEP OF FORMING, IN THE IMMEDIATE VICINITY OF SAID METAL, AND SUBJECTING SAID METAL TO AN ATMOSPHERE CONTAINING A CORROSION-INHIBITING CONCENTRATION OF VAPORS OF A NITRITE SALT OF AN N-HETEROCYCLIC ORGANIC BASE, SAID HETEROCYCLIC BASE HAVING AT LEAST 5 ATOMS IN THE RING STRUCTURE THEREOF, SAID NITRITE SALT HAVING A VAPOR PRESSURE OF AT LEAST 0.00002 MM. HG AT 21*C., SAID ATMOSPHERE, UPON DISPERSION IN WATER, YIELDING A SOLUTION HAVING A PH VALUE OF AT LEAST ABOUT 6.
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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) | 1956-03-02 | 1956-09-01 | 1957-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-02 | 1960-09-01 | 1961-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-02 | 1964-09-01 | 1965-03-03 | $7700.00 | Window Closed / Lapsed |