Patent US3273110A successfully refreshed from Google Patents.
US3273110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater communication system
Assignee: Douglas Aircraft Co Inc
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Filing: 1964-03-02
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Granted: 1966-09-13
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Expires: 1984-03-02
Abstract
No abstract record available.
Inventors
- 👤 Monroe Harold Richard
- 👤 Vadim N Erdman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:11
CPC Classifications
H; H04; H04B; H04B13/00; H04B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A COMMUNICATION SYSTEM FOR A STATION DISPOSED IN A CONDUCTIVE MEDIUM, SAID SYSTEM INCLUDING A RECEIVER CIRCUIT COMPRISING: AN IMPEDANCE MATCHING INPUT TRANSFORMER HAVING AN INPUT WINDING AND AN OUTPUT WINDING, SAID INPUT TRANSFORMER HAVING AN IMPEDANCE RATIO OF MORE THAN 1 TO 1000 AND HAVING SAID INPUT WINDING ADAPTED TO BE CONNECTED TO A PAIR OF SPACED PROBES DISPOSED IN THE CONDUCTIVE MEDIUM; A FIRST CAPACITOR CONNECTED ACROSS SAID OUTPUT WINDING, FOR DISSIPATING SIGNALS OF HIGHER THAN AUDIO FREQUENCY WHEREBY BROADCAST SIGNALS AND THE LIKE ARE GENERALLY DISSIPATED; A FIRST TRANSISTOR AMPLIFIER STAGE INCLUDING A FIRST TRANSISTOR CONNECTED IN A FIRST COMMON EMITTER AMPLIFYING CIRCUIT HAVING A BASE-EMITTER INPUT AND A COLLECTOE-EMITTER OUTPUT, SAID FIRST TRANSISTOR HAVING A FLOATING, NON-DIRECT CURRENT BIASED BASE WHEREBY INPUT SIGNALS TO SAID BASE OF SAID FIRST TRANSISTOR ARE NOT LOADED DOWN BY A BIAS RESISTOR; A SECOND CAPACITOR CONNECTED IN SERIES BETWEEN ONE SIDE OF SAID OUTPUT WINDING AND SAID BASE OF SAID FIRST TRANSISTOR, THE OTHER SIDE OF SAID OUTPUT WINDING BEING CONNECTED TO SAID EMITTER OF SAID FIRST TRANSISTOR WHEREBY THE HIGH IMPEDANCE SIDE OF SAID INPUT TRANSFORMER IS CONNECTED TO SAID BASE-EMITTER INPUT OF
Claim 2
Dependent Claim
194 words
A COMMUNICATION SYSTEM FOR A STATION DISPOSED IN A CONDUCTIVE MEDIUM, SAID SYSTEM INCLUDING A RECEIVER CIRCUIT COMPRISING: AN IMPEDANCE MATCHING INPUT TRANSFORMER HAVING AN INPUT WINDING AND AN OUTPUT WINDING, SAID INPUT TRANSFORMER HAVING AN IMPEDANCE RATIO OF MORE THAN 1 TO 1000 AND HAVING SAID INPUT WINDING ADAPTED TO BE CONNECTED TO A PAIR OF SPACED PROBES DISPOSED IN THE CONDUCTIVE MEDIUM; A FIRST CAPACITOR CONNECTED ACROSS SAID OUTPUT WINDING, FOR DISSIPATING SIGNALS OF HIGHER THAN AUDIO FREQUENCY WHEREBY BROADCAST SIGNALS AND THE LIKE ARE GENERALLY DISSIPATED; A FIRST TRANSISTOR AMPLIFIER STAGE INCLUDING A FIRST TRANSISTOR CONNECTED IN A FIRST COMMON EMITTER AMPLIFYING CIRCUIT HAVING A BASE-EMITTER INPUT AND A COLLECTOE-EMITTER OUTPUT, SAID FIRST TRANSISTOR HAVING A FLOATING, NON-DIRECT CURRENT BIASED BASE WHEREBY INPUT SIGNALS TO SAID BASE OF SAID FIRST TRANSISTOR ARE NOT LOADED DOWN BY A BIAS RESISTOR; A SECOND CAPACITOR CONNECTED IN SERIES BETWEEN ONE SIDE OF SAID OUTPUT WINDING AND SAID BASE OF SAID FIRST TRANSISTOR, THE OTHER SIDE OF SAID OUTPUT WINDING BEING CONNECTED TO SAID EMITTER OF SAID FIRST TRANSISTOR WHEREBY THE HIGH IMPEDANCE SIDE OF SAID INPUT TRANSFORMER IS CONNECTED TO SAID BASE-EMITTER INPUT OF
References Cited (Backward Citations)
US1051443A
Cited
US1331640A
Cited
US1197366A
Cited
US1233211A
Cited
US2404806A
Cited
US2499195A
Cited
US3003136A
Cited
US2997535A
Cited
US3138778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |