Patent US3309698A successfully refreshed from Google Patents.
US3309698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar systems
Assignee: Ferranti International PLC
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Filing: 1964-10-07
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Granted: 1967-03-14
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Expires: 1984-10-07
Abstract
No abstract record available.
Inventors
- 👤 Baldock George Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:27
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/03; G01S7/034
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
FOR USE IN A RADAR SYSTEM, A DUPLEXER COMBINATION OF FIRST AND SECOND WAVEGUIDE MULTI-ARM CIRCULATORS EACH HAVING ONE ARM CONNECTED TO ONE ARM OF THE OTHER FOR THE TRANSMISSION OF ELECTRICAL SIGNALS THEREBETWEEN, MEANS FOR SETTING UP WITHIN AT LEAST THE SECOND CIRCULATOR A MAGNETIC FIELD THE POLARITY CONDITION OF WHICH CONTROLS THE MODE OF ENERGY TRANSFER BETWEEN THE ARMS OF SAID CIRCULATOR, AN ABSORPTIVE LOAD CONNECTED TO ANOTHER ARM OF THE SECOND CIRCULATOR, AND CONTROL MEANS FOR REVERSING THE MAGNETIC FIELD POLARITY CONDITIONS WITHIN THE SECOND CIRCULATOR AT WILL.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |