US2808531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for electrical discharge tubes
Assignee: Siemens and Halske AG
•
Filing: 1953-03-10
•
Granted: 1957-10-01
•
Expires: 1973-03-10
Abstract
No abstract record available.
Inventors
- 👤 Katz Helmut
- 👤 Costa Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:06
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2175345A
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US2452075A
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US2460739A
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US2673277A
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US2647216A
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US2640949A
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US2640950A
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US2687489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |