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US3770652A
Expired / Lapsed
US
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Glassy silicate corrosion inhibitor with controlled solution rate
Assignee: Calgon Corp
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Filing: 1972-06-12
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Granted: 1973-11-06
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Expires: 1992-06-12
Abstract
Abstract THE CORROSION OF METALS, ESPECIALLY COPPER, IN AN AQUEOUS SYSTEM IS INHIBITED BY TREATING THE WATER WITH A GLASSY, CONTROLLED SOLUBILIY RATE, SILICATE COMPOSITION CONSISTING ESSENTIALLY OF SIO2 AND METAL OXIDES IN A MOLAR RATIO OF SIO2 TO METAL OXIDE OF FROM ABOUT 1:35:1.0 TO ABOUT 1.0:1.35 WHEREIN THE PREFERRED METAL OXIDES ARE K2O, NA2O AND CAO.
Inventors
- 👤 R Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:23
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/182; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C4/00; C03C4/0035
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |