US3135959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doppler antenna array employing multiple slotted waveguides with feed switching
Assignee: Decca Ltd
•
Filing: 1960-03-24
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Granted: 1964-06-02
•
Expires: 1980-03-24
Abstract
No abstract record available.
Inventors
- 👤 Moran Michael James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:58
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/004
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
129 words
AN AERIAL SYSTEM FOR USE IN MICROWAVE DOPPLER AIRBORNE NAVIGATIONAL EQUIPMENT COMPRISING AN ARRAY FORMED OF TWO SETS OF PARALLEL ROWS OF RADIATING SLOTS, EACH SET COMPRISING A NUMBER OF ROWS SIDE BY SIDE WITH THE SLOTS IN EACH ROW OF ONE SET BEING PHASED RADIATING SLOTS TO PRODUCE CO-OPERATIVELY A FIRST DIRECTIONAL BEAM AND THE SLOTS IN EACH ROW OF THE OTHER SET BEING ANTIPHASE RADIATING SLOTS TO PRODUCE CO-OPERATIVELY A SECOND DIRECTIONAL BEAM IN A DIRECTION, COMPARED TO SAID FIRST BEAM, ON THE OPPOSITE SIDE OF A PLANE NORMAL TO THE DIRECTION OF SAID ROWS, A SIGNAL SOURCE, A SINGLE TRANSVERSE FEED GUIDE COUPLED TO ALL THE ROWS IN BOTH SETS, AND SWITCH MEANS FOR CONNECTING SAID SIGNAL SOURCE ALTERNATIVELY TO EITHER END OF SAID FEED GUIDE.
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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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |