US2878409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispenser-type cathode and method of making
Assignee: US Philips Corp
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Filing: 1957-04-29
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Granted: 1959-03-17
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Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 Levi Roberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:15
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
30 words
A DISPENSER-TYPE CATHODE COMPRISING AN INHERENTLY SELF-SUPPORTING, REFRACTORY-METAL, POROUS BODY, AND THORIUM METAL IN THE PORES OF SAID BODY AND CONSTITUTING NOT MORE THAN 30% BY VOLUME OF THE 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) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |