Patent US2550149A successfully refreshed from Google Patents.
US2550149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination duplication for photography
Assignee: Individual
•
Filing: 1946-09-14
•
Granted: 1951-04-24
•
Expires: 1966-09-14
Abstract
No abstract record available.
Inventors
- 👤 Halten W Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:26
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1335832A
Cited
US1520738A
Cited
US1888600A
Cited
DE656570C
Cited
US2188224A
Cited
US2289315A
Cited
US2325569A
Cited
US2443357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |