Patent US3230500A successfully refreshed from Google Patents.
US3230500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission of telephony spectrum over vlf channels
Assignee: Individual
•
Filing: 1963-08-26
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Granted: 1966-01-18
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Expires: 1983-08-26
Abstract
No abstract record available.
Inventors
- 👤 Cletus M Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:23
CPC Classifications
H; H04; H04B; H04B13/00; H04B13/02; H04B1/00; H04B1/02; H04B1/03; H04B1/034; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A SYSTEM FOR THE TRANSMISSION OF AN INFINITELY VARIABLE WAVEFORM SIGNAL STATION A FIRST STATION TO A SECOND DISTANT UNDERWATER STATION OVER A VLF CHANNEL WHICH COMPRISES: (A) MEANS FOR GENERATING SAID WAVEFORM SIGNAL, (B) FIRST REPRODUCER MEANS FOR EXTENDING THE TIME DURATION OF SAID WAVEFORM SIGNAL THEREBY DECREASING ITS BANDWIDTH, (C) A VLF TRANSMITTER HAVING A MODULATOR MEANS FOR APPLYING SAID EXTENDED WAVEFORM SINGAL TO SAID MODULATOR SAID TRANSMITTING THE SAME AS A MODULATED CARRIER WAVE, (D) A CONVERTER LINK COMPRISING: (1) AN ANTENNA FOR RECEIVING A VLF CHANNEL (2) A VLF RECEIVER FOR CONVERTING SAID MODULATED WAVE AN AUDIO SIGNAL, (3) A TRANSDUCER IMMERSED IN THE WATER, (4) MEANS FOR APPLYING SAID AUDIO SIGNAL TO SAID TRANDUCER, SAID TRANSDUCER CONVERTING SAID TRANSMITTING SAID AUDIO SIGNAL INTO AN UNDERWATER ACOUSTIC SIGNAL,
Claim 2
Independent Claim
132 words
A SYSTEM FOR THE TRANSMISSION OF AN INFINITELY VARIABLE WAVEFORM SIGNAL STATION A FIRST STATION TO A SECOND DISTANT UNDERWATER STATION OVER A VLF CHANNEL WHICH COMPRISES: (A) MEANS FOR GENERATING SAID WAVEFORM SIGNAL, (B) FIRST REPRODUCER MEANS FOR EXTENDING THE TIME DURATION OF SAID WAVEFORM SIGNAL THEREBY DECREASING ITS BANDWIDTH, (C) A VLF TRANSMITTER HAVING A MODULATOR MEANS FOR APPLYING SAID EXTENDED WAVEFORM SINGAL TO SAID MODULATOR SAID TRANSMITTING THE SAME AS A MODULATED CARRIER WAVE, (D) A CONVERTER LINK COMPRISING: (1) AN ANTENNA FOR RECEIVING A VLF CHANNEL (2) A VLF RECEIVER FOR CONVERTING SAID MODULATED WAVE AN AUDIO SIGNAL, (3) A TRANSDUCER IMMERSED IN THE WATER, (4) MEANS FOR APPLYING SAID AUDIO SIGNAL TO SAID TRANDUCER, SAID TRANSDUCER CONVERTING SAID TRANSMITTING SAID AUDIO SIGNAL INTO AN UNDERWATER ACOUSTIC SIGNAL,
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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |