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US3778377A
Expired / Lapsed
US
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Protecting metal during acid contact
Assignee: Universal Oil Products Co
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Filing: 1971-10-06
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Granted: 1973-12-11
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Expires: 1991-10-06
Abstract
Abstract PROTECTING METAL DURING CONTACT WITH ACID BY INCORPORATING AN INHIBITOR MIXTURE OF A POLYAMINOMETHYLENEPHOSPHONATE AND AN N,N''-DICYCLOALKYL-THIOURA. THE INHIBITOR MIXTURE IS USED IN DESCALING, ACID CLEANING, ACID PICKLING, ETC.
Inventors
- 👤 H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:00
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |