Patent DE449985C successfully refreshed from Google Patents.
Patent US3308329A successfully refreshed from Google Patents.
US3308329A
Expired / Lapsed
US
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Thermionic emissive cathode with end structure for emissive suppression
Assignee: Northrop Grumman Systems Corp
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Filing: 1962-11-23
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Granted: 1967-03-07
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Expires: 1982-11-23
Abstract
No abstract record available.
Inventors
- 👤 Robert J Foreman
- 👤 Joseph A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:50
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/14; H01J7/18; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J23/00; H01J23/02; H01J23/04; H01J23/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A CATHODE ASSEMBLY STRUCTURE ADAPTED FOR USE IN AN EVACUATED HIGH TEMPERATURE THERMIONIC ELECTRON EMISSIVE DEVICE HAVING AN ANODE AND OPPOSITELY SPACED POLE PIECES WITH AXIALLY ALIGNED LONGITUDINAL BORES COMPRISING: A TUBULAR SPINDLE AXIALLY POSITIONED AND SPACED TO EXTEND THROUGH SAID ANODE AND INTO THE LONGITUDINAL BORES OF SAID POLE PIECES, A THERMIONIC CATHODE, EMPLOYING BARIUM COMPOUNDS CAPABLE OF PROVIDING ELECTRON EMISSION, MOUNTED ON SAID SPINDLE IN SPACED RELATIONSHIP WITH SAID ANODE, TRANSVERSELY OUTSTANDING ANNULAR FLANGES FUNCTIONING AS EMISSION END SHIELDS MOUNTED ON SAID SPINDLE AND SPACED FROM EACH END OF SAID CATHODE AND ADJACENT THE OPENINGS F SAID LONGITUDINAL ORES, AND A CONTINUOUS LAYER OF A ZIRCONIUM-NICKEL ALLOY HAVING EMISSION SUPPRESSION AND GETTERING PROPERTIES INTEGRAL WITH AND EXTENDING ALONG AT LEAST A PORTION OF SAID FLANGES AND SAID SPINDLE TO A POSITION SUBSTANTIALLY WITHIN SAID BORES.
Claim 2
Dependent Claim
137 words
A CATHODE ASSEMBLY STRUCTURE ADAPTED FOR USE IN AN EVACUATED HIGH TEMPERATURE THERMIONIC ELECTRON EMISSIVE DEVICE HAVING AN ANODE AND OPPOSITELY SPACED POLE PIECES WITH AXIALLY ALIGNED LONGITUDINAL BORES COMPRISING: A TUBULAR SPINDLE AXIALLY POSITIONED AND SPACED TO EXTEND THROUGH SAID ANODE AND INTO THE LONGITUDINAL BORES OF SAID POLE PIECES, A THERMIONIC CATHODE, EMPLOYING BARIUM COMPOUNDS CAPABLE OF PROVIDING ELECTRON EMISSION, MOUNTED ON SAID SPINDLE IN SPACED RELATIONSHIP WITH SAID ANODE, TRANSVERSELY OUTSTANDING ANNULAR FLANGES FUNCTIONING AS EMISSION END SHIELDS MOUNTED ON SAID SPINDLE AND SPACED FROM EACH END OF SAID CATHODE AND ADJACENT THE OPENINGS F SAID LONGITUDINAL ORES, AND A CONTINUOUS LAYER OF A ZIRCONIUM-NICKEL ALLOY HAVING EMISSION SUPPRESSION AND GETTERING PROPERTIES INTEGRAL WITH AND EXTENDING ALONG AT LEAST A PORTION OF SAID FLANGES AND SAID SPINDLE TO A POSITION SUBSTANTIALLY WITHIN SAID BORES.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |