Patent US3145353A successfully refreshed from Google Patents.
US3145353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable delay using dielectric screw rotatable inside surrounding helical transmission line
Assignee: National Research Council Canada
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Filing: 1962-05-21
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Granted: 1964-08-18
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Expires: 1982-05-21
Abstract
No abstract record available.
Inventors
- 👤 William J Bleackley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:06
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/19; H01P1/22; H01P1/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A MICROWAVE DEVICE COMPRISING A CABLE HAVING AN INNER AND AN OUTER CONDUCTOR SEPARATED BY A FIRST DIELECTRIC MATERIAL, SAID CABLE BEING IN THE FORM OF A CYLINDRICAL HELIX OF A PREDETERMINED PITCH AND HAVING A CENTRAL AXIS, SAID OUTER CONDUCTOR AND SAID FIRST DIELECTRIC MATERIAL HAVING A CHORDAL RECESS EXTENDING ALONG SAID CABLE FROM END TO END OF SAID HELIX, THE WALL OF SAID RECESS PASSING ADJACENT SAID INNER CONDUCTOR AND CONSTITUTING AN INTERIOR SURFACE OF SAID HELIX, AND A WORM CORE OF A SECOND DIELECTRIC MATERIAL HAVING A PITCH OF SUBSTANTIALLY SAID PREDETERMINED PITCH AND A LONGITUDINAL AXIS, SAID CORE BEING MOUNTED WITHIN SAID HELIX FOR ROTATION ABOUT SAID LONGITUDINAL AXIS WITH SAID LONGITUDINAL AND CENTRAL AXES BEING COINCI-
Claim 2
Dependent Claim
121 words
A MICROWAVE DEVICE COMPRISING A CABLE HAVING AN INNER AND AN OUTER CONDUCTOR SEPARATED BY A FIRST DIELECTRIC MATERIAL, SAID CABLE BEING IN THE FORM OF A CYLINDRICAL HELIX OF A PREDETERMINED PITCH AND HAVING A CENTRAL AXIS, SAID OUTER CONDUCTOR AND SAID FIRST DIELECTRIC MATERIAL HAVING A CHORDAL RECESS EXTENDING ALONG SAID CABLE FROM END TO END OF SAID HELIX, THE WALL OF SAID RECESS PASSING ADJACENT SAID INNER CONDUCTOR AND CONSTITUTING AN INTERIOR SURFACE OF SAID HELIX, AND A WORM CORE OF A SECOND DIELECTRIC MATERIAL HAVING A PITCH OF SUBSTANTIALLY SAID PREDETERMINED PITCH AND A LONGITUDINAL AXIS, SAID CORE BEING MOUNTED WITHIN SAID HELIX FOR ROTATION ABOUT SAID LONGITUDINAL AXIS WITH SAID LONGITUDINAL AND CENTRAL AXES BEING COINCI-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |