US2913812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sintered cathodes
Assignee: Thales SA
•
Filing: 1955-06-13
•
Granted: 1959-11-24
•
Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 Huber Harry
- 👤 Freytag Jean
- 👤 Reynaud Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:21
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12146; Y10T428/12493; Y10T428/1266; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE METHOD OF MANUFACTURING A TABLET TO BE USED AS EMISSIVE PORTION OF A SINTERED CATHODE FOR ELECTRON DISCHARGE TUBES, COMPRISING THE STEPS OF FILLING A CONTAINER WITH A BARIUM EMISSIVE COMPOSITION IN POWDER STATE; INITIALLY COMPRESSING SAID COMPOSITION; COVERING SAID INITIALLY COMPRESSED COMPOSITION WITH A SUPERFICIAL LAYER OF A REFRACTORY METALLIC POWDER HAVING A THICKNESS WHICH IS A FRACTION OF THAT OF SAID INITIALLY COMPRESSED COMPOSITION; THEREAFTER EXERTING A PRESSURE ON SAID LAYER FOR PRESSING SAID METALLIC POWDER ONTO SAID INITIALLY COMPRESSED COMPOSITION TO FORM A POROUS TABLET HAVING A METAL LAYER COVERING SAID EMISSIVE COMPOSITION; CONTROLLING SAID PRESSURE TO DETERMINE THE POROSITY OF SAID METAL LAYER; SINTER-
Claim 2
Dependent Claim
48 words
A TABLET TO BE USED AS EMISSIVE PORTION OF A SINTERED CATHODE, COMPRISING A METALLIC SURFACE LAYER OBTAINED BY THE METHOD OF CLAIM 2, SAID EMISSIVE COMPOSITION HAVING A THICKNESS OF ABOUT ONE TO TWO MILLIMETERS AND SAID FILM HAVING A THICKNESS OF ABOUT TEN TO TWENTY MICRONS.
References Cited (Backward Citations)
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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) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |