US3215937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extremely low-frequency antenna
Assignee: Control Data Corp
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Filing: 1962-08-27
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Granted: 1965-11-02
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Expires: 1982-08-27
Abstract
No abstract record available.
Inventors
- 👤 Robert L Tanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:59
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
AN ANTENNA FOR TRANSMITTING EXTREMELY-LOW-FREQUENCY SIGNALS COMPRISING A FIRST AND SECOND CONDUCTOR EXTENDING ALONG THE EARTH, SPACED PARALLEL FROM ONE ANOTHER FOR A PREDETERMINED DISTANCE, MEANS FOR APPLYING EXTREMELY-LOW-FREQUENCY EXCITATION TO EACH OF SAID CONDUCTORS SUBSTANTIALLY AT THEIR CENTERS AT A REFERENCE PHASE, MEANS FOR APPLYING EXTREMELY-LOW-FREQUENCY EXCITATION TO SAID CONDUCTORS SUBSTANTIALLY AT THEIR CENTERS AT A PHASE WHICH IS SHIFTED 90* RELATIVE TO SAID REFERENCE PHASE, A PLURALITY OF REACTIVE IMPEDANCES, AND MEANS FOR CONNECTING A DIFFERENT ONE OF SAID REACTIVE IMPEDANCES BETWEEN SPACED POINTS ALONG EACH OF SAID CONDUCTORS AND GROUND.
Claim 2
Dependent Claim
93 words
AN ANTENNA FOR TRANSMITTING EXTREMELY-LOW-FREQUENCY SIGNALS COMPRISING A FIRST AND SECOND CONDUCTOR EXTENDING ALONG THE EARTH, SPACED PARALLEL FROM ONE ANOTHER FOR A PREDETERMINED DISTANCE, MEANS FOR APPLYING EXTREMELY-LOW-FREQUENCY EXCITATION TO EACH OF SAID CONDUCTORS SUBSTANTIALLY AT THEIR CENTERS AT A REFERENCE PHASE, MEANS FOR APPLYING EXTREMELY-LOW-FREQUENCY EXCITATION TO SAID CONDUCTORS SUBSTANTIALLY AT THEIR CENTERS AT A PHASE WHICH IS SHIFTED 90* RELATIVE TO SAID REFERENCE PHASE, A PLURALITY OF REACTIVE IMPEDANCES, AND MEANS FOR CONNECTING A DIFFERENT ONE OF SAID REACTIVE IMPEDANCES BETWEEN SPACED POINTS ALONG EACH OF SAID CONDUCTORS AND GROUND.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |