US3202993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation systems
Assignee: Decca Ltd
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Filing: 1961-01-30
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Granted: 1965-08-24
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Expires: 1981-01-30
Abstract
No abstract record available.
Inventors
- 👤 O'brien William Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:03
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/30; G01S1/306
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A TRANSMITTING SYSTEM FOR A RATIO NAVIGATION SYSTEM COMPRISING AT LEAST THREE SPACED TRANSMITTERS, EACH ARRANGED TO RADIATE ALL THE TIME BUT ONLY ONE SIGNAL BEING TRANSMITTED FROM ANY TRANSMITTER AT ANY TIME WHEREIN EACH TRANSMITTER RADIATES ONE OF FOUR DIFFERENT FREQUENCIES WHICH ARE ALL HARMONICS OF A COMMON FUNDAMENTAL FEQQUENCY WITH ALL THE STATIONS RADIATING DIFFERENT FREQUENCIES WHICH ARE ALL LOCKED IN PHASE AND EACH TRANSMITTER RADIATING ALTERNATELY ON TWO DIFFERENT FREQUENCIES WHICH DIFFER IN FREQUENCY BY SAID FUNDAMENTAL FREQUENCY BUT WHICH ARE LOCKED IN PHASE.
Claim 2
Dependent Claim
87 words
A TRANSMITTING SYSTEM FOR A RATIO NAVIGATION SYSTEM COMPRISING AT LEAST THREE SPACED TRANSMITTERS, EACH ARRANGED TO RADIATE ALL THE TIME BUT ONLY ONE SIGNAL BEING TRANSMITTED FROM ANY TRANSMITTER AT ANY TIME WHEREIN EACH TRANSMITTER RADIATES ONE OF FOUR DIFFERENT FREQUENCIES WHICH ARE ALL HARMONICS OF A COMMON FUNDAMENTAL FEQQUENCY WITH ALL THE STATIONS RADIATING DIFFERENT FREQUENCIES WHICH ARE ALL LOCKED IN PHASE AND EACH TRANSMITTER RADIATING ALTERNATELY ON TWO DIFFERENT FREQUENCIES WHICH DIFFER IN FREQUENCY BY SAID FUNDAMENTAL FREQUENCY BUT WHICH ARE LOCKED IN PHASE.
References Cited (Backward Citations)
US2844816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |