Patent US4099843A successfully refreshed from Google Patents.
Patent US3250946A successfully refreshed from Google Patents.
US3250946A
Expired / Lapsed
US
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Travelling wave tube, in which an electron beam interacts with a helical delay line, having spurious oscillation suppressing means
Assignee: US Philips Corp
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Filing: 1962-02-01
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Granted: 1966-05-10
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Expires: 1982-02-01
Abstract
No abstract record available.
Inventors
- 👤 Dechering Johannes A Bernardus
- 👤 Spanhoff Georg Arnold Wi Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:53
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/26; H01J23/30; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H03; H03F; H03F3/00; H03F3/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A TRAVELLING-WAVE TUBE ARRANGEMENT COMPRISING AN ENVELOPE, A RIGIDLY SUPPORTED HELICAL DALAY LINE WITHIN THE ENVELOPE, INPUT AND OUTPUT WAVE-GUIDE MEANS COUPLED TO THE RESPECTIVE ENDS OF THE HELICAL DELAY LINE, A FIRST CYLINDRICAL WAVE-GUIDE SURROUNDING THE ENVELOPE CONNECTING THE INPUT AND OUTPUT WAVE-GUIDES, A TUBULAR CONDUCTOR CONSTITUTING A SECOND CYLINDRICAL WAVE-GUIDE HAVING A HIGHER CUT-OFF FREQUENCY THAN SAID FIRST CYLINDRICAL WAVE-GUIDE SURROUNDING AND EXTENDING ABOUT HALF TO THREE-FOURTHS OF THE LENGTH OF THE DELAY LINE, AND A DISC-SHAPED CONDUCTOR BETWEEN THE ENDS OF THE HELICAL DELAY LINE CONNECTING THE FIRST AND SECOND CYLINDRICAL WAVE-GUIDES FOR PREVENTING FEED-BACK COUPLING BETWEEN THE INPUT AND OUTPUT WAVEGUIDES.
Claim 2
Dependent Claim
105 words
A TRAVELLING-WAVE TUBE ARRANGEMENT COMPRISING AN ENVELOPE, A RIGIDLY SUPPORTED HELICAL DALAY LINE WITHIN THE ENVELOPE, INPUT AND OUTPUT WAVE-GUIDE MEANS COUPLED TO THE RESPECTIVE ENDS OF THE HELICAL DELAY LINE, A FIRST CYLINDRICAL WAVE-GUIDE SURROUNDING THE ENVELOPE CONNECTING THE INPUT AND OUTPUT WAVE-GUIDES, A TUBULAR CONDUCTOR CONSTITUTING A SECOND CYLINDRICAL WAVE-GUIDE HAVING A HIGHER CUT-OFF FREQUENCY THAN SAID FIRST CYLINDRICAL WAVE-GUIDE SURROUNDING AND EXTENDING ABOUT HALF TO THREE-FOURTHS OF THE LENGTH OF THE DELAY LINE, AND A DISC-SHAPED CONDUCTOR BETWEEN THE ENDS OF THE HELICAL DELAY LINE CONNECTING THE FIRST AND SECOND CYLINDRICAL WAVE-GUIDES FOR PREVENTING FEED-BACK COUPLING BETWEEN THE INPUT AND OUTPUT WAVEGUIDES.
References Cited (Backward Citations)
US2857547A
Cited
US2988659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |