US3346860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation system
Assignee: International Standard Electric Corp
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Filing: 1965-05-10
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Granted: 1967-10-10
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Expires: 1985-05-10
Abstract
No abstract record available.
Inventors
- 👤 Earp Charles William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:56
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/30; G01S1/304; G01S1/306; G01S11/00; G01S11/02; G01S5/00; G01S5/0009
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A RADIO NAVIGATION SYSTEM COMPRISING: A TRANSMITTER INCLUDING: FIRST MEANS FOR GENERATING A FIRST WAVE HAVING A FIRST FREQUENCY; SECOND MEANS FOR GENERATING ONLY WAVES UNILATERALLY DISPLACED IN THE SAME SENSE FROM SAID FIRST FREQUENCY, SAID UNILATERALLY DISPLACED WAVES INCLUDING TWO WAVES DISPLACED FROM SAID FIRST FREQUENCY BY HARMONICALLY RELATED DIFFERENCE FREQUENCIES; AND MEANS COUPLED TO SAID GENERATING MEANS TO TRANSMIT SAID TWO WAVES; AND A RECEIVER FOR RECEIVING THE SAID TWO TRANSMITTED WAVES, SAID RECEIVER INCLUDING: MEANS TO DERIVE FROM SAID TRANSMITTED WAVES A SIGNAL HAVING A PHASE PROPORTIONAL TO THE PHASE THAT THE WAVE AT THE SAID FIRST FREQUENCY WOULD HAVE HAD AT THE RECEIVER IF TRANSMITTED FROM SAID TRANSMITTER.
Claim 2
Dependent Claim
112 words
A RADIO NAVIGATION SYSTEM COMPRISING: A TRANSMITTER INCLUDING: FIRST MEANS FOR GENERATING A FIRST WAVE HAVING A FIRST FREQUENCY; SECOND MEANS FOR GENERATING ONLY WAVES UNILATERALLY DISPLACED IN THE SAME SENSE FROM SAID FIRST FREQUENCY, SAID UNILATERALLY DISPLACED WAVES INCLUDING TWO WAVES DISPLACED FROM SAID FIRST FREQUENCY BY HARMONICALLY RELATED DIFFERENCE FREQUENCIES; AND MEANS COUPLED TO SAID GENERATING MEANS TO TRANSMIT SAID TWO WAVES; AND A RECEIVER FOR RECEIVING THE SAID TWO TRANSMITTED WAVES, SAID RECEIVER INCLUDING: MEANS TO DERIVE FROM SAID TRANSMITTED WAVES A SIGNAL HAVING A PHASE PROPORTIONAL TO THE PHASE THAT THE WAVE AT THE SAID FIRST FREQUENCY WOULD HAVE HAD AT THE RECEIVER IF TRANSMITTED FROM SAID TRANSMITTER.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |