US2520760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing cathodes for electronic tubes
Assignee: Thales SA
•
Filing: 1947-04-09
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Granted: 1950-08-29
•
Expires: 1967-04-09
Abstract
No abstract record available.
Inventors
- 👤 Gallet George
- 👤 Thien-Chi Nguyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:04
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/24; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
54 words
INDIRECTLY HEATED EMITTING CATHODE COMPRISING A HEATING FILAMENT, A THIN INSULATING COATING DIRECTLY APPLIED ON THE FILAMENT, A BODY OF SINTERED METALLIC POWDER FORMING A RIGID BLOCK IN INTIMATE CONTACT WITH THE SAID INSULATED FILAMENT WHICH IS EMBEDDED THEREIN, AND A LAYER OF THERMO-EMISSIVE SUBSTANCE DIRECTLY DEPOSITED ON THE SURFACE OF THE SAID BODY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |