US2737607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescible cathode
Assignee: Hartford National Bank and Trust Co
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Filing: 1952-07-05
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Granted: 1956-03-06
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Expires: 1972-07-05
Abstract
No abstract record available.
Inventors
- 👤 Lemmens Hendrikus Johannes
- 👤 Jansen Marinus Jacobus
- 👤 Haayman Pieter Willem
- 👤 Linden Petrus Cornelis Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:10
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A DISPENSER CATHODE COMPRISING A STRUCTURE FORMING AN INTERNAL CAVITY AND HAVING AN ELECTRON EMISSIVE SURFACE, A POROUS SINTERED BODY OF REFRACTOR METAL FORMING PART OF THE WALL OF SAID STRUCTURE, SAID STRUCTURE BEING TIGHTLY CLOSED WITH THE PORES OF SAID WALL PORTION CONSTITUTING THE LARGEST PASSAGEWAYS CONNECTING THE CAVITY TO SAID ELECTRON EMISSIVE SURFACE, AND A SUPPLY WITHIN SAID CAVITY OF AN ALKALINE EARTH MATERIAL CAPABLE OF FURNISHING FREE ALKALINE EARTH METAL TO SAID ELECTRON-EMISSIVE SURFACE AT A RATE SUFFICIENT TO MAINTAIN A MONOMOLECULAR LAYER OF ALKALINE EARTH METAL THEREON, SAID MATERIAL CONSISTING ESSENTIALLY OF AN ALKALINE EARTH BORIDE.
Claim 2
Dependent Claim
100 words
A DISPENSER CATHODE COMPRISING A STRUCTURE FORMING AN INTERNAL CAVITY AND HAVING AN ELECTRON EMISSIVE SURFACE, A POROUS SINTERED BODY OF REFRACTOR METAL FORMING PART OF THE WALL OF SAID STRUCTURE, SAID STRUCTURE BEING TIGHTLY CLOSED WITH THE PORES OF SAID WALL PORTION CONSTITUTING THE LARGEST PASSAGEWAYS CONNECTING THE CAVITY TO SAID ELECTRON EMISSIVE SURFACE, AND A SUPPLY WITHIN SAID CAVITY OF AN ALKALINE EARTH MATERIAL CAPABLE OF FURNISHING FREE ALKALINE EARTH METAL TO SAID ELECTRON-EMISSIVE SURFACE AT A RATE SUFFICIENT TO MAINTAIN A MONOMOLECULAR LAYER OF ALKALINE EARTH METAL THEREON, SAID MATERIAL CONSISTING ESSENTIALLY OF AN ALKALINE EARTH BORIDE.
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) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |