US2986799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cathodes
Assignee: US Philips Corp
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Filing: 1957-01-03
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Granted: 1961-06-06
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Expires: 1977-01-03
Abstract
No abstract record available.
Inventors
- 👤 Levi Roberto
- 👤 Oisher Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:47
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A METHOD OF MANUFACTURING AN ELECTRON DEVICE CONTAINING AN ELECTRON-PRODUCING CATHODE, COMPRISING FORMING A HARD, STRONG, FULLY-SINTERED, POROUS TUNGSTEN MEMBER WITH A DENSITY BETWEEN 60% AND 90% OF THE THEORETICAL DENSITY OF A NON-POROUS BODY AND WHOSE PORES ARE FILLED WITH AN OXIDIC COMPOSITION INCLUDING BARIUM CAPABLE OF REACTING WHEN HEATED WITH TUNGSTEN IN A MANNER PRODUCTIVE OF FREE BARIUM VAPOR, SUBJECTING SAID FORMED MEMBER TO A MACHINING CUTTING OPERATION TO REMOVE MATERIAL AND FORM A BODY OF GIVEN SHAPE AND DIMENSIONS HAVING A SMOOTH EXTERNAL SURFACE PORTION, AND THEREAFTER ASSEMBLING SAID MACHINED BODY WITH SAID OXIDIC COMPOSITION IN ITS PORES IN A DEVICE IN ELECTRON-PRODUCING RELATIONSHIP THEREIN.
Claim 2
Independent Claim
108 words
A METHOD OF MANUFACTURING AN ELECTRON DEVICE CONTAINING AN ELECTRON-PRODUCING CATHODE, COMPRISING FORMING A HARD, STRONG, FULLY-SINTERED, POROUS TUNGSTEN MEMBER WITH A DENSITY BETWEEN 60% AND 90% OF THE THEORETICAL DENSITY OF A NON-POROUS BODY AND WHOSE PORES ARE FILLED WITH AN OXIDIC COMPOSITION INCLUDING BARIUM CAPABLE OF REACTING WHEN HEATED WITH TUNGSTEN IN A MANNER PRODUCTIVE OF FREE BARIUM VAPOR, SUBJECTING SAID FORMED MEMBER TO A MACHINING CUTTING OPERATION TO REMOVE MATERIAL AND FORM A BODY OF GIVEN SHAPE AND DIMENSIONS HAVING A SMOOTH EXTERNAL SURFACE PORTION, AND THEREAFTER ASSEMBLING SAID MACHINED BODY WITH SAID OXIDIC COMPOSITION IN ITS PORES IN A DEVICE IN ELECTRON-PRODUCING RELATIONSHIP THEREIN.
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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |