US2472304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of etching aluminum
Assignee: Alcoa Corp
•
Filing: 1944-03-13
•
Granted: 1949-06-07
•
Expires: 1964-03-13
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:32
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; C25F3/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB190429093A
Cited
US1047995A
Cited
US1011203A
Cited
GB294237A
Cited
US1751213A
Cited
US2090966A
Cited
US2062273A
Cited
US2079081A
Cited
GB467024A
Cited
US2168909A
Cited
US2209712A
Cited
US2336846A
Cited
GB520108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |