US2858470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for electron discharge devices
Assignee: AT&T Inc
•
Filing: 1955-02-02
•
Granted: 1958-10-28
•
Expires: 1975-02-02
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Thurber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:05
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/04; H01J23/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A CATHODE STRUCTURE COMPRISING A METALLIC CORE, A SINTERED MATRIX SECURED TO THE OUTER SURFACE OF SAID CORE, SAID MATRIX COMPRISING A PLURALITY OF TUNGSTEN PARTICLES, EACH COMPLETELY COATED WITH NICKEL, AND A HEATER ELEMENT FOR HEATING SAID CORE AND MATRIX.
Claim 2
Dependent Claim
41 words
A CATHODE STRUCTURE COMPRISING A METALLIC CORE, A SINTERED MATRIX SECURED TO THE OUTER SURFACE OF SAID CORE, SAID MATRIX COMPRISING A PLURALITY OF TUNGSTEN PARTICLES, EACH COMPLETELY COATED WITH NICKEL, AND A HEATER ELEMENT FOR HEATING SAID CORE AND MATRIX.
References Cited (Backward Citations)
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US2472189A
Cited
US2392879A
Cited
US2538873A
Cited
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Cited
US2594897A
Cited
US2724070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |