US2643178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition
Assignee: Shell Development Co
•
Filing: 1946-04-19
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Granted: 1953-06-23
•
Expires: 1966-04-19
Abstract
No abstract record available.
Inventors
- 👤 Wachter Aaron
- 👤 Stillman Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:48
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/36; C; C23; C23F; C23F11/00; C23F11/02; Y; Y10; Y10S; Y10S62/00; Y10S62/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN A METHOD OF INHIBITING CORROSION OF A METAL NORMALLY CORRODIBLE BY CONTACT WITH WATER VAPOR AND OXYGEN, THE STEP OF FORMNG, IN THE IMMEDIATE VICINITY OF SAID METAL AND SUBJECTING SAID METAL TO, AN ATMOSPHERE CONTAINING A CORROSIONINHIBITING CONCENTRATION OF AN ORGANIC AMMONIUM 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 6.
Claim 2
Dependent Claim
76 words
IN A METHOD OF INHIBITING CORROSION OF A METAL NORMALLY CORRODIBLE BY CONTACT WITH WATER VAPOR AND OXYGEN, THE STEP OF FORMNG, IN THE IMMEDIATE VICINITY OF SAID METAL AND SUBJECTING SAID METAL TO, AN ATMOSPHERE CONTAINING A CORROSIONINHIBITING CONCENTRATION OF AN ORGANIC AMMONIUM 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 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) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |