US3788880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inhibiting corrosion of metal surfaces
Assignee: Stahlwerke Pein Salzgitter AG
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Filing: 1972-01-20
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Granted: 1974-01-29
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Expires: 1992-01-20
Abstract
Abstract A METAL SURFACE, E.G. OF BRASS, IS COATED WITH A PRECIPITATE OF A CORROSION-RETARDING INORGANIC SALT (E.G. A CALCITE) FROM WATER (PREFERABLY ORDINARY UTILITY WATER CONTAINING THE SALT AND UNDER THE ELECTROCHEMICAL EFFECT OF LOCAL POLARITY DIFFERENCES ALONG THE METAL BODY), WHEREUPON THE CORROSION-INHIBITING LAYER IS USED TO BOND, BY ION-EXCHANGE INTERACTION, AN ION-EXCHANGE SUBSTANCE TO THE SURFACE, TOGETHER, THE CORROSION-INHIBITING AND IONEXCHANGE SUBSTANCES (A ZEOLITE, NATURAL OR SYNTHETIC) FOR A THREE-DIMENSIONAL STABLE COATING WHICH IS ADHERENT AND PREVENTS LOCALIZED CORROSION.
Inventors
- 👤 E Mensenkamp
- 👤 P Cordes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:17
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/68; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |