US2434378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic reversing unit and system for producing reversed images
Assignee: Sun Chemical Corp
•
Filing: 1944-07-15
•
Granted: 1948-01-13
•
Expires: 1964-07-15
Abstract
No abstract record available.
Inventors
- 👤 Stephen N Wekeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:25
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USRE17995E
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US1268577A
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US1278132A
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CH142184A
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US2107829A
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US2137570A
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US2275905A
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US2284562A
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US2282656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-12 | 1951-07-14 | 1952-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-12 | 1955-07-14 | 1956-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-12 | 1959-07-14 | 1960-01-13 | $7700.00 | Window Closed / Lapsed |