US3600334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thoriated cathodes and method for making the same
Assignee: Siemens AG
•
Filing: 1968-04-23
•
Granted: 1971-08-17
•
Expires: 1988-04-23
Abstract
Abstract THORIATED HOT CATHODES IN WHICH THE METAL CARBIDE SUCH AS W2C OR M02C IS TRANSFORMED FROM HEXAGOANL TO BODY CENTERED CUBIC MODIFICATION. THIS IS DONE AT AN ELEVATED TEMPERATURE BY WAY OF A SOLID-STATE REACTION, IN THE PRESENCE OF A SUITABLE METAL CATALYST. D R A W I N G
Inventors
- 👤 Istvan Koncz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:28
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |