US2950993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide coated cathodes and method of manufacture
Assignee: RCA Corp
•
Filing: 1956-04-02
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Granted: 1960-08-30
•
Expires: 1976-04-02
Abstract
No abstract record available.
Inventors
- 👤 Umbreit Stanton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:00
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J9/00; H01J9/02; H01J9/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2949; Y10T428/2973
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
THE METHOD OF ATTACHING AN ELECTRON EMISSIVE LAYER TO A CONDUCTIVE CORE WHICH COMPRISES FIRST APPLYING IN A FORM OF A SUSPENSION TO SAID CORE SUBSTANTIALLY PURE AND HYDROXIDE FREE BARIUM CARBONATE TO FORM A FIRST COATING ON SAID CORE, AND THEN APPLYING TO SAID FIRST COATING A FURTHER COATING OF A MATERIAL CONSISTING OF BARIUM CARBONATE, STRONTIUM CARBONATE AND CALCIUM CARBONATE FOR FORMING AN ELECTRON EMISSIVE OXIDE, AND HEATING THE DOUBLY COATED CORE TO CONVERT SAID SUBSTANTIALLY PURE BARIUM CARBONATE INTO BARIUM OXIDE AND TO FORM AT LEAST A PARTIALLY FUSED BARIUM OXIDE LAYER IN DIRECT SURFACE CONTACT WITH SAID CORE AND WITH SAID MATERIAL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |