US2921498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical control device for use with photographic color enlargers and printers
Assignee: Simmon Brothers Inc
•
Filing: 1957-09-12
•
Granted: 1960-01-19
•
Expires: 1977-09-12
Abstract
No abstract record available.
Inventors
- 👤 Simmon Alfred
- 👤 Louis L Weisglass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:52
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/73
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE687405C
Cited
US2665065A
Cited
US2518947A
Cited
US2573113A
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US2740828A
Cited
US2764060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |