Patent US3249938A successfully refreshed from Google Patents.
US3249938A
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Fm radio ranging system
Assignee: Lockheed Martin Corp
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Filing: 1963-11-18
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Granted: 1966-05-03
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Expires: 1983-11-18
Abstract
No abstract record available.
Inventors
- 👤 Blitz Daniel
- 👤 Kincaid Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:32
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/345
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN A FM RANGING SYSTEM OF THE TYPE INCLUDING A MIXER DEVELOPING A BEAT FREQUENCY SIGNAL CORRESPONDING TO THE DIFFERENCE BETWEEN THE TRANSMITTED AND RECEIVED FREQUENCIES AND A PHASE SHIFTER CONNECTED TO VARY THE RELATIVE PHASE OF THE INPUT SIGNALS OF SAID MIXER, THE IMPROVEMENT INCLUDING: (A) RATE SENSING MEANS DEVELOPING A RATE SIGNAL CORRESPONDING TO THE RATE OF RANGE VARIATION, AND (B) MEANS RESPONSIVE TO SAID RATE SIGNAL FOR CHANING THE RATE OF PHASE CHANGE BETWEEN SAID MIXER INPUT SIGNALS.
Claim 2
Dependent Claim
81 words
IN A FM RANGING SYSTEM OF THE TYPE INCLUDING A MIXER DEVELOPING A BEAT FREQUENCY SIGNAL CORRESPONDING TO THE DIFFERENCE BETWEEN THE TRANSMITTED AND RECEIVED FREQUENCIES AND A PHASE SHIFTER CONNECTED TO VARY THE RELATIVE PHASE OF THE INPUT SIGNALS OF SAID MIXER, THE IMPROVEMENT INCLUDING: (A) RATE SENSING MEANS DEVELOPING A RATE SIGNAL CORRESPONDING TO THE RATE OF RANGE VARIATION, AND (B) MEANS RESPONSIVE TO SAID RATE SIGNAL FOR CHANING THE RATE OF PHASE CHANGE BETWEEN SAID MIXER INPUT 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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |