US2621560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for eliminating interference between the optical trains of a photographic reproducing apparatus
Assignee: Engineering Research Associates Inc
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Filing: 1949-11-17
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Granted: 1952-12-16
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Expires: 1969-11-17
Abstract
No abstract record available.
Inventors
- 👤 Lawrence R Steinhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:39
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |