US2864028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic dispenser cathode
Assignee: US Philips Corp
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Filing: 1955-08-15
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Granted: 1958-12-09
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Expires: 1975-08-15
Abstract
No abstract record available.
Inventors
- 👤 Patrick P Coppola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:15
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A DISPENSER CATHODE COMPRISING A POROUS SINTERED TUNGSTEN BODY, A SUPPLY OF A FUSED MIXTURE OF BARIUM OXIDE AND ALUMINUM OXIDE CONTAINING A MOLAR EXCESS OF BARIUM OXIDE WITHIN THE PORES OF SAID BODY, AND A PLURALITY OF SPACED APART MOLYBEDENUM STRIPS EMBEDDED IN A SURFACE OF THE BODY CONSTITUTING THE EMISSIVE SURFACE OF THAT BODY, SAID STRIPS BEING INTEGRALLY UNITED WITH THE SINTERED BODY TO PROVIDE ZONES IN WHICH SURFACE PORES ARE COMPLETELY CLOSED, SAID STRIPS HAVING A WIDTH NOT SUBSTANTIALLY EXCEEDING THE MIGRATION DISTANCE OF BARIUM OVER MOLYBDENUM.
Claim 2
Dependent Claim
90 words
A DISPENSER CATHODE COMPRISING A POROUS SINTERED TUNGSTEN BODY, A SUPPLY OF A FUSED MIXTURE OF BARIUM OXIDE AND ALUMINUM OXIDE CONTAINING A MOLAR EXCESS OF BARIUM OXIDE WITHIN THE PORES OF SAID BODY, AND A PLURALITY OF SPACED APART MOLYBEDENUM STRIPS EMBEDDED IN A SURFACE OF THE BODY CONSTITUTING THE EMISSIVE SURFACE OF THAT BODY, SAID STRIPS BEING INTEGRALLY UNITED WITH THE SINTERED BODY TO PROVIDE ZONES IN WHICH SURFACE PORES ARE COMPLETELY CLOSED, SAID STRIPS HAVING A WIDTH NOT SUBSTANTIALLY EXCEEDING THE MIGRATION DISTANCE OF BARIUM OVER MOLYBDENUM.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |