US2792273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide coated nickel cathode and method of activation
Assignee: General Electric Co
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Filing: 1954-01-14
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Granted: 1957-05-14
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Expires: 1974-01-14
Abstract
No abstract record available.
Inventors
- 👤 James E Beggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:30
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J9/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
THE METHOD OF ACTIVATING THE ELECTRON EMITTING SURFACE OF AN ELECTRON TUBE WHICH INCLUDES AN ANODE MADE FROM METAL FROM THE TITANIUM GROUP, A SUBSTANTIALLY PURE NICKEL CATHODE PROVIDING A PASSIVE SUPPORT, COMPRISING COATING THE SAID ANODE AND SAID PASSIVE SUPPORT WITH AT LEAST ONE ALKALI EARTH METAL CARBONATE, HEATING THE ANODE AND CATHODE TO AN ELEVATED TEMPERATURE IN VACUUM TO DECOMPOSE THE CARBONATE TO ALKALI EARTH METAL OXIDE, FURTHER HEATING THE ANODE AND CATHODE TO A HIGHER TEMPERATURE TO CAUSE SAID ALKALI EARTH OXIDE ON THE ANODE TO BE REDUCED AND THE ALKALI EARTH METAL EVAPORATED FROM THE ANODE ONTO THE COATED SUPPORT TO ACTIVATE SAID OXIDE COATING THEREON.
Claim 2
Independent Claim
110 words
THE METHOD OF ACTIVATING THE ELECTRON EMITTING SURFACE OF AN ELECTRON TUBE WHICH INCLUDES AN ANODE MADE FROM METAL FROM THE TITANIUM GROUP, A SUBSTANTIALLY PURE NICKEL CATHODE PROVIDING A PASSIVE SUPPORT, COMPRISING COATING THE SAID ANODE AND SAID PASSIVE SUPPORT WITH AT LEAST ONE ALKALI EARTH METAL CARBONATE, HEATING THE ANODE AND CATHODE TO AN ELEVATED TEMPERATURE IN VACUUM TO DECOMPOSE THE CARBONATE TO ALKALI EARTH METAL OXIDE, FURTHER HEATING THE ANODE AND CATHODE TO A HIGHER TEMPERATURE TO CAUSE SAID ALKALI EARTH OXIDE ON THE ANODE TO BE REDUCED AND THE ALKALI EARTH METAL EVAPORATED FROM THE ANODE ONTO THE COATED SUPPORT TO ACTIVATE SAID OXIDE COATING THEREON.
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) | 1960-05-13 | 1960-11-12 | 1961-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-13 | 1964-11-12 | 1965-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-13 | 1968-11-12 | 1969-05-14 | $7700.00 | Window Closed / Lapsed |