US2700626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary electron emissive electrodes
Assignee: AT&T Inc
•
Filing: 1949-12-09
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Granted: 1955-01-25
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Expires: 1969-12-09
Abstract
No abstract record available.
Inventors
- 👤 Hallam E Mendenhall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:51
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/12; H01J9/125; H01J1/00; H01J1/02; H01J1/32; H01J2201/00; H01J2201/32; Y; Y10; Y10S; Y10S118/00; Y10S118/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
THE METHOD OF MAKING A SECONDARY ELECTRON EMITTER WHICH COMPRISES APPLYING TO A METAL BASE A FILM OF A HIGH TEMPERATURE MELTING POINT OXIDE INSULATOR, APPLYING A FILM OF BERYLLIUM ON SAID OXIDE FILM, AND HEATING THE COMPOSITE UNIT TO EFFECT DIFFUSION OF THE IMPURITIES FROM THE BASE INTO THE OXIDE.
Claim 2
Independent Claim
51 words
THE METHOD OF MAKING A SECONDARY ELECTRON EMITTER WHICH COMPRISES APPLYING TO A METAL BASE A FILM OF A HIGH TEMPERATURE MELTING POINT OXIDE INSULATOR, APPLYING A FILM OF BERYLLIUM ON SAID OXIDE FILM, AND HEATING THE COMPOSITE UNIT TO EFFECT DIFFUSION OF THE IMPURITIES FROM THE BASE INTO THE OXIDE.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-24 | 1958-07-26 | 1959-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-24 | 1962-07-26 | 1963-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-24 | 1966-07-26 | 1967-01-25 | $7700.00 | Window Closed / Lapsed |