Patent US3689417A successfully refreshed from Google Patents.
US3689417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powderless etching bath
Assignee: Resonac Holdings Corp
•
Filing: 1970-06-03
•
Granted: 1972-09-05
•
Expires: 1990-06-03
Abstract
Abstract AN IMPROVED POWDERLESS ETCHING BATH FOR ETCHING ALUMINUM OR AN ALUMINUM-BASE ALLOY COMPRISING (A) AN ACID AQUEOUS SOLUTION CONTAINING SULFURIC ACID, (B) METAL IONS OF A METAL HAVING A IONIZATION TENDENCY LESS THAN THAT OF ALUMINUM, (C) A WATER-IMMISCIBLE ORGANIC LIQUID, (D) A PHOSPHATE ESTER ANIONIC SURFACTANT, AND (E) A NONIONIC SURFACTANT.
Inventors
- 👤 Takashi Oikawa
- 👤 Takeshi Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:20
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/42
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |