US3669615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibiting method
Assignee: CNA Holdings LLC
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Filing: 1970-09-28
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Granted: 1972-06-13
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Expires: 1990-09-28
Abstract
Abstract A LIQUID CORROSION INHIBITOR AND METHOD DESIGNED FOR USE BY WATER TREATMENT PLANTS FOR THE CONTROL OF CORROSION OF MUNICIPAL, INDUSTRIAL, COMMERCIAL AND DOMESTIC METAL PIPING SYSTEMS, WHEREIN AS THE INHIBITOR IS ECONOMICALLY ADDED TO THE FLOWING WATER SUPPLY IN MINUTE DOSAGES, IT PASSIVATES THE SURFACE OF THE METAL PIPING AS IT DEPOSITS A SELF-CONTROLLED FILM OF INSOLUBLE ZINC PHOSPHATE. ONE OF THE PREFERRED INHIBITORS INCLUDES ZINC, SULFAMATE, AND ORTHOPHOSPHATE IONS. TO BE EFFECTIVE, THE PH MUST BE CONTROLLED TO WITHIN THE RANGE OF 5-9.
Inventors
- 👤 William Bruce Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:15
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/125; C23; C23F; C23F11/00; C23F11/08
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |