US2809552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant density multiple color plate
Assignee: Individual
•
Filing: 1955-10-25
•
Granted: 1957-10-15
•
Expires: 1975-10-25
Abstract
No abstract record available.
Inventors
- 👤 Ciavola Alexander William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:59
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/73
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1878857A
Cited
US696860A
Cited
GB190105356A
Cited
US862336A
Cited
US1480486A
Cited
US1971737A
Cited
US2063222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |