Patent US3588899A successfully refreshed from Google Patents.
US3588899A
Expired / Lapsed
US
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Measuring device for example,frequency-modulation radio altimeter
Assignee: US Philips Corp
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Filing: 1968-09-10
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Granted: 1971-06-28
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Expires: 1988-09-10
Abstract
Abstract A FREQUENCY MODULATED, CONTINUOUS WAVE RADIO ALTIMETER WITH MEANS FOR AUTOMATICALLY ADJUSTING LINEAR AND NONLINEAR FEEDBACK CIRCUITS CONTROLLING THE MAPLITUDE AND FREQUENCY OF TRIANGULAR MODULATING WAVE SIGNALS USED IN RANGE MEASUREMENTS DURING PROGRAMMED CALIBRATION TIME PERIODS THAT ARE INTERPOSED BETWEEN OPERATIONAL TIME PERIODS WHEN RANGE MEASUREMENTS ARE MADE. THE SIGNALS TRANSMITTED TO AND RECEIVED FROM A TARGET DURING THE MEASURING PERIODS ARE PASSED THROUGH A KNOWN DELAY LINE DURING THE CALIBRATION PERIODS TO MAKE THESE ADJUSTMENTS WHICH ARE MAINTAINED DURING THE SUBSEQUENT MEASUREMENT PERIOD.
Inventors
- 👤 Raymond Strauch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:39
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4052; G01S7/4056; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/341; G01S13/88; G01S13/882; G01S7/406; G01S7/4065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |