US2528308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflector camera having film feeding means and spherical film support
Assignee: Individual
•
Filing: 1946-08-10
•
Granted: 1950-10-31
•
Expires: 1966-08-10
Abstract
No abstract record available.
Inventors
- 👤 Helm Carl Henrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:48
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0888
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2282869A
Cited
US1082678A
Cited
US1224304A
Cited
US2049041A
Cited
US1927887A
Cited
US2036428A
Cited
US2295802A
Cited
US2403660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |