Patent US2643176A successfully refreshed from Google Patents.
US2643176A
Expired / Lapsed
US
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Compositions for protection of metals against corrosion
Assignee: Shell Development Co
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Filing: 1946-10-28
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Granted: 1953-06-23
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Expires: 1966-10-28
Abstract
No abstract record available.
Inventors
- 👤 Wachter Aaron
- 👤 Stillman Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:00
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/36; C; C23; C23F; C23F11/00; C23F11/02; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A MATERIAL CAPABLE OF INHIBITING CORROSION OF A METAL BY AN ATOMSPHERE CONTAINING OXYGEN AND WATER VAPOR, WHICH COMPRISES A SUBSTANTIALLY SOLID FIBROUS MATERIAL CONTAINING A CORROSIONINHIBITING AMOUNT OF AN ORGANIC NITROGEN-BASE NITRITE SALT HAVING A VAPOR PRESSURE OF AT LEAST ABOUT 0.00002 MM. HG AT 12* C.
Claim 2
Dependent Claim
48 words
A MATERIAL CAPABLE OF INHIBITING CORROSION OF A METAL BY AN ATOMSPHERE CONTAINING OXYGEN AND WATER VAPOR, WHICH COMPRISES A SUBSTANTIALLY SOLID FIBROUS MATERIAL CONTAINING A CORROSIONINHIBITING AMOUNT OF AN ORGANIC NITROGEN-BASE NITRITE SALT HAVING A VAPOR PRESSURE OF AT LEAST ABOUT 0.00002 MM. HG AT 12* C.
References Cited (Backward Citations)
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US1847711A
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US2148862A
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US2304950A
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US2344404A
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US2416734A
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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 |