Patent US2745069A successfully refreshed from Google Patents.
US2745069A
Expired / Lapsed
US
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Microwave magnetized ferrite attenuator
Assignee: AT&T Inc
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Filing: 1950-05-17
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Granted: 1956-05-08
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Expires: 1970-05-17
Abstract
No abstract record available.
Inventors
- 👤 Jr William H Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:03
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/22; H01P1/23; H03; H03H; H03H7/00; H03H7/24; H03H7/25; H03H7/258
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
IN COMBINATION, A CONDUCTIVELY BOUNDED MICROWAVE TRANSMISSION STRUCTURE, MEANS FOR INTRODUCING LINEARLY POLARIZED ELECTROMAGNETIC WAVES INTO SAID STRUCTURE AT ONE POINT, A LOAD ASSOCIATED WITH SAID STRUCTURE AT ANOTHER POINT FOR UTILIZING SAID WAVES AFTER PROPAGATION FROM SAID ONE POINT TO SAID OTHER POINT, A SOLID BODY COMPRISING FERRITE LOCATED WITHIN SAID STRUCTURE BETWEEN SAID POINTS, AND MEANS FOR APPLYING A MAGNETIC FIELD TO SAID BODY IN A DIRECTION PARALLEL TO THAT OF THE POLARIZATION OF SAID WAVES, SAID BODY BEING AN ELONGATED ELEMENT OF CROSS SECTION LESS THAN THE INTERNAL CROSS SECTION OF SAID STRUCTURE AND BEING SUBSTANTIALLY LONGITUDINALLY ARRANGED IN SAID STRUCTURE.
References Cited (Backward Citations)
US2197123A
Cited
US2402948A
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US2452530A
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US2452531A
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US2532157A
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US2491662A
Cited
US2629079A
Cited
US2644930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |