US2789491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for deep-etching, preferably of printing plates
Assignee: CLICHE AS
•
Filing: 1954-08-31
•
Granted: 1957-04-23
•
Expires: 1974-08-31
Abstract
No abstract record available.
Inventors
- 👤 Blandhoel Bjarne Eugen
- 👤 Knut M Iversen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:07
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/08; B; B41; B41C; B41C1/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1575408A
Cited
US2286883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |