US3692575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of dispenser cathode for electronic discharge vessels
Assignee: Siemens AG
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Filing: 1970-10-23
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Granted: 1972-09-19
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Expires: 1990-10-23
Abstract
Abstract A METHOD OF PROVIDING A LAYER OF METAL OF THE PLATINUM GROUP, I.E., OSMIUM, IRIDUM, ON THE CATHODE OF A DISPENSER CATHODE STRUCTURE, BY THE SEPARATION THROUGH CHEMICAL EXTRACTION OUT OF AN APPROPRIATE SOLUBLE COMPOUND OF THE METAL, FOR EXAMPLE, OXIDE HYDRATE OR CHLORIDE, WITH REDUCTION, POSSIBLY IN AN H2 ATMOSPHERE, AND SINTERING.
Inventors
- 👤 Wolfgang Nestler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:58
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
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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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |