Patent US2559770A successfully refreshed from Google Patents.
US2559770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic copying apparatus
Assignee: Bell and Howell Co
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Filing: 1950-06-26
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Granted: 1951-07-10
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Expires: 1970-06-26
Abstract
No abstract record available.
Inventors
- 👤 Elmer L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:33
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |