Patent US3403281A successfully refreshed from Google Patents.
US3403281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetron having rapid starting property when cold
Assignee: Teledyne UK Ltd
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Filing: 1966-06-10
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Granted: 1968-09-24
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Expires: 1986-06-10
Abstract
No abstract record available.
Inventors
- 👤 Weaver Francis James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:28
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/04; H01J23/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A MAGNETRON HAVING A CATHODE STRUCTURE COMPRISING A SECONDARY ELECTRON EMISSIVE CATHODE MEMBER ADAPTED TO PROVIDE AT LEAST THE MAJOR PART OF THE REQUIRED ELECTRON EMISSION BY SECONDARY EMISSION BY ELECTRON BOMBARDMENT WHEN THE MAGNETRON IS IN NORNAL OPERATION, AND A FILAMENTARY THERMIONIC EMITTER ADAPTED TO PROVIDE EMISSION FOR RAPIDLY STARTING AND MAGNETRON INTO OPERATION FROM COLD.
Claim 2
Dependent Claim
57 words
A MAGNETRON HAVING A CATHODE STRUCTURE COMPRISING A SECONDARY ELECTRON EMISSIVE CATHODE MEMBER ADAPTED TO PROVIDE AT LEAST THE MAJOR PART OF THE REQUIRED ELECTRON EMISSION BY SECONDARY EMISSION BY ELECTRON BOMBARDMENT WHEN THE MAGNETRON IS IN NORNAL OPERATION, AND A FILAMENTARY THERMIONIC EMITTER ADAPTED TO PROVIDE EMISSION FOR RAPIDLY STARTING AND MAGNETRON INTO OPERATION FROM COLD.
References Cited (Backward Citations)
US2097302A
Cited
DE940181C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |