Patent US3340529A successfully refreshed from Google Patents.
US3340529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fm altimeter with reduced step error
Assignee: Lockheed Martin Corp
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Filing: 1963-06-11
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Granted: 1967-09-05
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Expires: 1983-06-11
Abstract
No abstract record available.
Inventors
- 👤 Blitz Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:08
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
66 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 REFLECTED SIGNAL FREQUENCIES, MEANS FOR COUNTING THE CYCLES OF THE BEAT FREQUENCY AT THE OUTPUT OF SAID MIXER, AND A PHASE SHIFTER CONNECTED TO CONTINUOUSLY VARY THE PHASE OF ONE OF THE INPUTS TO SAID MIXER, THE IMPROVEMENT IN WHICH SAID PHASE
Claim 2
Dependent Claim
66 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 REFLECTED SIGNAL FREQUENCIES, MEANS FOR COUNTING THE CYCLES OF THE BEAT FREQUENCY AT THE OUTPUT OF SAID MIXER, AND A PHASE SHIFTER CONNECTED TO CONTINUOUSLY VARY THE PHASE OF ONE OF THE INPUTS TO SAID MIXER, THE IMPROVEMENT IN WHICH SAID PHASE
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) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |