Patent US3201720A successfully refreshed from Google Patents.
US3201720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slow wave filter helix structure
Assignee: TDK Micronas GmbH
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Filing: 1960-02-11
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Granted: 1965-08-17
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Expires: 1980-02-11
Abstract
No abstract record available.
Inventors
- 👤 Dean C Bradford
- 👤 Louis J Krzych
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:03
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A SLOW WAVE FILTER HELIX STRUCTURE FOR A TRAVELING WAVE TUBE COMPRISING A METALLIC HELIX FORMING A TRANSMISSION LINE FOR ELECTROMAGNETIC WAVES, PARALLEL INSULATING SUPPORT RODS CONTACTIN SAID HELIX LONGITUDINALLY, AND A PLURALITY OF ELECTRICAL LOADING ELEMENTS IN THE FORM OF METAL FASTENERS EACH RIGIDLY AFFIXING ONLY ONE OF SAID RODS TO SAID HELIX AND FORMING AN INTEGRAL STRUCTURE AND DIRECT ELECTRICAL CONNECTION THEREWITH, SAID ELEMENTS BEING ARRANGED ON EACH ROD IN GROUPS PERIODICALLY SPACED ALONG SAID HELIX TO ESTABLISH SELECTIVE PASS-BAND CHARACTERISTICS OF SPACE HARMONIC COMPONENTS IN THE PROPAGATION OF SAID WAVES THROUGH SAID TUBE.
Claim 2
Dependent Claim
96 words
A SLOW WAVE FILTER HELIX STRUCTURE FOR A TRAVELING WAVE TUBE COMPRISING A METALLIC HELIX FORMING A TRANSMISSION LINE FOR ELECTROMAGNETIC WAVES, PARALLEL INSULATING SUPPORT RODS CONTACTIN SAID HELIX LONGITUDINALLY, AND A PLURALITY OF ELECTRICAL LOADING ELEMENTS IN THE FORM OF METAL FASTENERS EACH RIGIDLY AFFIXING ONLY ONE OF SAID RODS TO SAID HELIX AND FORMING AN INTEGRAL STRUCTURE AND DIRECT ELECTRICAL CONNECTION THEREWITH, SAID ELEMENTS BEING ARRANGED ON EACH ROD IN GROUPS PERIODICALLY SPACED ALONG SAID HELIX TO ESTABLISH SELECTIVE PASS-BAND CHARACTERISTICS OF SPACE HARMONIC COMPONENTS IN THE PROPAGATION OF SAID WAVES THROUGH SAID TUBE.
References Cited (Backward Citations)
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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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |