Patent US3200286A successfully refreshed from Google Patents.
US3200286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave amplifier tube having novel stop-band means to prevent backward wave oscillations
Assignee: Varian Medical Systems Inc
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Filing: 1960-12-30
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Granted: 1965-08-10
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Expires: 1980-12-30
Abstract
No abstract record available.
Inventors
- 👤 William L Rorden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:16
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/26; H01J23/27
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
IN A TRAVELING WAVE AMPLIFIER DEVICE WHEREIN ENERGY IS EXCHANGED BETWEEN AN ELECTRON BEAM AND THE FIELD OF A RADIO FREQUENCY WAVE, APPARATUS FOR PROPAGATING THE RADIO FREQUENCY WAVE COMPRISING A SLOW-WAVE HELICAL CONDUCTOR, SAID SLOW-WAVE HELICAL CONDUCTOR HAVING DISCRETE AREAS OF NON-UNIFORM CROSS SECTION AT UNIFORM INTERVALS ALONG THE HELICAL CONDUCTOR TO PROVIDE A STOP BAND FOR BACKWARD WAVE OSCILLATIONS, THE SPACING BETWEEN SAID DISCRETE AREAS OF NON-UNIFORM CROSS SECTION BEING SUBSTANTIALLY EQUAL TO ONE-HALF WAVE LENGTH OF THE BACKWARD WAVE OSCILLATION FREQUENCY.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-09 | 1969-02-08 | 1969-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-09 | 1973-02-08 | 1973-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-09 | 1977-02-08 | 1977-08-10 | $7700.00 | Window Closed / Lapsed |