US2643177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase corrosion inhibition of metals
Assignee: Shell Development Co
•
Filing: 1946-05-07
•
Granted: 1953-06-23
•
Expires: 1966-05-07
Abstract
No abstract record available.
Inventors
- 👤 Wachter Aaron
- 👤 Stillman Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 07:57
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/36; C; C23; C23F; C23F11/00; C23F11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE COMBINATION COMPRISING A METAL ARTICLE NORMALLY CORRODIBLE BY CONTACT WITH WATER VAPOR AND OXYGEN, AND A SUBSTANTIALLY SOLID COVERING MATERIAL ENCLOSING SAID METAL ARTICLE, SAID COVERING MATERIAL CONTAINING AN ORGANIC AMMONIUM NITRITE SALT HAVING A VAPOR PRESSURE OF AT LEAST ABOUT 0.0001 MM. HG AT 21* C., SAID NITRITE SALT BEING PRESENT IN AN AMOUNT SUFFICIENT TO MAINTAIN A CORROSION-INHIBITING ATMOSPHERE WHICH, UPON DISPERSION IN WATER, YIELDS A SOLUTION HAVING A PH VALUE OF AT LEAST ABOUT 6.
Claim 2
Dependent Claim
79 words
THE COMBINATION COMPRISING A METAL ARTICLE NORMALLY CORRODIBLE BY CONTACT WITH WATER VAPOR AND OXYGEN, AND A SUBSTANTIALLY SOLID COVERING MATERIAL ENCLOSING SAID METAL ARTICLE, SAID COVERING MATERIAL CONTAINING AN ORGANIC AMMONIUM NITRITE SALT HAVING A VAPOR PRESSURE OF AT LEAST ABOUT 0.0001 MM. HG AT 21* C., SAID NITRITE SALT BEING PRESENT IN AN AMOUNT SUFFICIENT TO MAINTAIN A CORROSION-INHIBITING ATMOSPHERE WHICH, UPON DISPERSION IN WATER, YIELDS 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) | 1956-06-22 | 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 |