Patent US2653626A successfully refreshed from Google Patents.
Patent US2614942A successfully refreshed from Google Patents.
US2614942A
Expired / Lapsed
US
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Thermionic cathode
Assignee: Hartford National Bank and Trust Co
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Filing: 1949-08-25
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Granted: 1952-10-21
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Expires: 1969-08-25
Abstract
No abstract record available.
Inventors
- 👤 Loosjes Robert
- 👤 Antonius Josephus V Genuchten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:01
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0735; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T428/298
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A CATHODE COMPRISING A BODY COMPOSED OF A SINTERED MIXTURE OF THORIUM OXIDE AND A REFRACTORY METAL, AND A DISCRETE THIN LAYER OF GIVEN THICKNESS OF THORIUM OXIDE COVERING SAID MIXTURE OF THORIUM OXIDE AND REFRACTORY METAL AND SINTERED TO SAID BODY.
Claim 2
Dependent Claim
42 words
A CATHODE COMPRISING A BODY COMPOSED OF A SINTERED MIXTURE OF THORIUM OXIDE AND A REFRACTORY METAL, AND A DISCRETE THIN LAYER OF GIVEN THICKNESS OF THORIUM OXIDE COVERING SAID MIXTURE OF THORIUM OXIDE AND REFRACTORY METAL AND SINTERED TO SAID BODY.
References Cited (Backward Citations)
US2339392A
Cited
US2477601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |