Patent US2159712A successfully refreshed from Google Patents.
US2159712A
Expired / Lapsed
US
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Electron ray tube
Assignee: Firm Fernseh A G
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Filing: 1934-04-20
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Granted: 1939-05-23
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Expires: 1954-04-20
Abstract
No abstract record available.
Inventors
- 👤 Schiff Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:44
CPC Classifications
C; C25; C25D; C25D7/00; C25D7/04; F; F02; F02F; F02F1/00; F02F1/18; F02F1/20; H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J31/00; H01J31/08; H01J31/10; H01J31/12
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) | 1942-05-22 | 1942-11-21 | 1943-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-22 | 1946-11-21 | 1947-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-22 | 1950-11-21 | 1951-05-23 | $7700.00 | Window Closed / Lapsed |