US2943237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-electrode tube circuit
Assignee: Bell and Howell Co
•
Filing: 1956-02-27
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Granted: 1960-06-28
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Expires: 1976-02-27
Abstract
No abstract record available.
Inventors
- 👤 Norton W Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:18
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H03; H03M; H03M1/00; H03M1/12; H03M1/34; H03M1/36; H03M1/361; H03M1/366; H01J2893/00; H01J2893/007
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) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |