Patent US3580739A successfully refreshed from Google Patents.
US3580739A
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Grid electrode for electronic tubes
Assignee: Siemens AG
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Filing: 1968-01-02
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Granted: 1971-05-25
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Expires: 1988-01-02
Abstract
Abstract THE INVENTION IS DIRECTED TO ELECTRONIC TUBES WHEREIN A GRID ELECTRODE IS CONSTRUCTED OF ANY ALLOY CONTAINING A ZIRCONIUM OXIDE WHICH MAY BE ADDED EITHER TO THE BASE METAL FORMING THE GRID WIRES IN AMOUNTS OF 0.1 TO 2% BY WEIGHT OR TO A COATING OF ZIRCONIUM IN AMOUNTS OF 10 TO 50% BY WEIGHT WHICH COVERS THE BASE METAL.
Inventors
- 👤 Gunter Ciriack
- 👤 Georg Eckert
- 👤 Horst Hofmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:21
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/002; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12146; Y10T428/12361; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12812
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |