Patent US3333270A successfully refreshed from Google Patents.
US3333270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation system
Assignee: Individual
•
Filing: 1952-10-10
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Granted: 1967-07-25
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Expires: 1972-10-10
Abstract
No abstract record available.
Inventors
- 👤 Robert M Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:50
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/02; G01S11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A NAVIGATION SYSTEM A SIGNAL ENERGY TRANSMISSION MEDIUM, FIRST AND SECOND MEANS FOR GENERATING SIGNALS ON FIRST AND SECOND FREQUENCIES HAVING DIFFERENT, RELATIVELY CONSTANT TRANSMISSION ATTENUATION COEFFICIENTS IN THE TRANSMISSION MEDIUM, FIRST AND SECOND ANTENNA MEANS COUPLED TO SAID SIGNAL GENERATING MEANS AND TO THE TRANSMISSION MEDIUM HAVING ESSENTIALLY THE SAME RADIATION PATTERNS, A REMOTE RECEIVING MEANS FOR RECEIVING SAID SIGNALS, AND MEANS CORRELATING THE DISTANCE OF SAID RECEIVING MEANS FROM SAID FIRST AND SECOND SIGNAL GENERATING MEANS IN TERMS OF THE RELATIVE AMPLITUDES OF THE RECEIVED SIGNALS.
Claim 2
Dependent Claim
89 words
IN A NAVIGATION SYSTEM A SIGNAL ENERGY TRANSMISSION MEDIUM, FIRST AND SECOND MEANS FOR GENERATING SIGNALS ON FIRST AND SECOND FREQUENCIES HAVING DIFFERENT, RELATIVELY CONSTANT TRANSMISSION ATTENUATION COEFFICIENTS IN THE TRANSMISSION MEDIUM, FIRST AND SECOND ANTENNA MEANS COUPLED TO SAID SIGNAL GENERATING MEANS AND TO THE TRANSMISSION MEDIUM HAVING ESSENTIALLY THE SAME RADIATION PATTERNS, A REMOTE RECEIVING MEANS FOR RECEIVING SAID SIGNALS, AND MEANS CORRELATING THE DISTANCE OF SAID RECEIVING MEANS FROM SAID FIRST AND SECOND SIGNAL GENERATING MEANS IN TERMS OF THE RELATIVE AMPLITUDES OF THE RECEIVED SIGNALS.
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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |