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Patent US3296578A successfully refreshed from Google Patents.
US3296578A
Expired / Lapsed
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Underwater direction indicator
Assignee: United States Naval Research Laboratory
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Filing: 1950-10-20
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Granted: 1967-01-03
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Expires: 1970-10-20
Abstract
No abstract record available.
Inventors
- 👤 Harold L Saxton
- 👤 Melvin S Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:06
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72; Y; Y10; Y10S; Y10S367/00; Y10S367/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
AN UNDERWATER DIRECTION INDICATOR COMPRISING THREE SPACED TRANSDUCERS FOR CONVERTING SOUND TO ELECTRICAL SIGNALS, SAID TRANSDUCERS BEING CENTERED SUBSTANTIALLY ON THREE CORNERS OF A SQUARE IN THE PLANE OF SAID TRANSDUCERS; THREE ALTERNATING CURRENT SIGNAL PATHS INCLUDING SUPERHETERODYNE AMPLIFIERS, SAID PATHS EACH HAVING AN INPUT COUPLED TO A DIFFERENT ONE OF SAID TRANSDUCERS; SAID AMPLIFIERS INCLUDING A COMMON SOURCE OF BEAT FREQUENCY OSCILLATIONS; AN OSCILLOSCOPE INCLUDING A HORIZONTAL DEFLECTION INPUT, A VERTICAL DEFLECTION INPUT AND BRIGHTNESS CONTROL INPUT; EACH OF THE OUTPUTS OF SAID THREE SIGNAL PATHS BEING COUPLED TO A DIFFERENT ONE OF THE INPUTS TO SAID OSCILLOSCOPE; THE PATH TO SAID BRIGHTNESS CONTROL INCLUDING A LIMITING MEANS FOR CLIPPING THE PEAKS AND SUBSTANTIALLY SQUARING OSCILLATORY SIGNALS PROPAGATING THEREIN AND A DIFFERENTIATING MEANS FOR CONVERTING SAID SQUARED SIGNALS TO NARROW BRIGHTENING PULSES CORRESPONDING IN AMPLITUDE TO THE TRANSIENT PORTIONS OF SAID SQUARED SIGNALS; AND MANUALLY OPERATED PHASE SHIFTERS LOCATED IN AT LEAST TWO OF SAID SIGNAL PATHS.
Claim 2
Dependent Claim
158 words
AN UNDERWATER DIRECTION INDICATOR COMPRISING THREE SPACED TRANSDUCERS FOR CONVERTING SOUND TO ELECTRICAL SIGNALS, SAID TRANSDUCERS BEING CENTERED SUBSTANTIALLY ON THREE CORNERS OF A SQUARE IN THE PLANE OF SAID TRANSDUCERS; THREE ALTERNATING CURRENT SIGNAL PATHS INCLUDING SUPERHETERODYNE AMPLIFIERS, SAID PATHS EACH HAVING AN INPUT COUPLED TO A DIFFERENT ONE OF SAID TRANSDUCERS; SAID AMPLIFIERS INCLUDING A COMMON SOURCE OF BEAT FREQUENCY OSCILLATIONS; AN OSCILLOSCOPE INCLUDING A HORIZONTAL DEFLECTION INPUT, A VERTICAL DEFLECTION INPUT AND BRIGHTNESS CONTROL INPUT; EACH OF THE OUTPUTS OF SAID THREE SIGNAL PATHS BEING COUPLED TO A DIFFERENT ONE OF THE INPUTS TO SAID OSCILLOSCOPE; THE PATH TO SAID BRIGHTNESS CONTROL INCLUDING A LIMITING MEANS FOR CLIPPING THE PEAKS AND SUBSTANTIALLY SQUARING OSCILLATORY SIGNALS PROPAGATING THEREIN AND A DIFFERENTIATING MEANS FOR CONVERTING SAID SQUARED SIGNALS TO NARROW BRIGHTENING PULSES CORRESPONDING IN AMPLITUDE TO THE TRANSIENT PORTIONS OF SAID SQUARED SIGNALS; AND MANUALLY OPERATED PHASE SHIFTERS LOCATED IN AT LEAST TWO OF SAID SIGNAL PATHS.
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |