US2917415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making thermionic dispenser cathode and cathode made by said method
Assignee: US Philips Corp
•
Filing: 1956-07-24
•
Granted: 1959-12-15
•
Expires: 1976-07-24
Abstract
No abstract record available.
Inventors
- 👤 Levi Roberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:32
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047; Y; Y10; Y10S; Y10S75/00; Y10S75/95; Y10S75/951; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12153; Y10T428/12493; Y10T428/1266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN A METHOD OF MANUFACTURING A THERMIONIC DISPENSER CATHODE CONTAINING A POROUS HIGH-DENSITY TUNGSTEN-CONTAINING REFRACTORY-METAL BODY WITH INTERCONNECTING PORES AND COMPRISING PROVIDING AN ALKALINE EARTH METAL COMPOSITION INCLUDING A BARIUM COMPOSITION DECOMPOSABLE TO THE OXIDE FORM, THE IMPROVEMENT COMPRISING PREFUSING SAID COMPOSITION OUTSIDE OF THE PORES OF AND OUT OF CONTACT WITH THE REFRACTORY-METAL BODY TO CONVERT SAME TO A MATERIAL CONSISTING ESSENTIALLY OF ALKALINE EARTH METAL OXIDES INCLUDING BARIUM OXIDE, AND HEATING SAID POROUS REFRACTORY-METAL BODY IN CONTACT WITH SAID LAST-FORMED
Claim 2
Dependent Claim
82 words
IN A METHOD OF MANUFACTURING A THERMIONIC DISPENSER CATHODE CONTAINING A POROUS HIGH-DENSITY TUNGSTEN-CONTAINING REFRACTORY-METAL BODY WITH INTERCONNECTING PORES AND COMPRISING PROVIDING AN ALKALINE EARTH METAL COMPOSITION INCLUDING A BARIUM COMPOSITION DECOMPOSABLE TO THE OXIDE FORM, THE IMPROVEMENT COMPRISING PREFUSING SAID COMPOSITION OUTSIDE OF THE PORES OF AND OUT OF CONTACT WITH THE REFRACTORY-METAL BODY TO CONVERT SAME TO A MATERIAL CONSISTING ESSENTIALLY OF ALKALINE EARTH METAL OXIDES INCLUDING BARIUM OXIDE, AND HEATING SAID POROUS REFRACTORY-METAL BODY IN CONTACT WITH SAID LAST-FORMED
References Cited (Backward Citations)
US1883840A
Cited
US1922244A
Cited
US2085605A
Cited
US2175345A
Cited
US2131204A
Cited
US2147447A
Cited
US2173259A
Cited
US2389060A
Cited
US2700118A
Cited
US2700000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |