Patent US3705986A successfully refreshed from Google Patents.
US3705986A
Expired / Lapsed
US
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Optical data transmission system
Assignee: Fujitsu IT Holdings Inc
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Filing: 1971-01-25
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Granted: 1972-12-12
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Expires: 1991-01-25
Abstract
Abstract DISCLOSED IS A POINT-TO-POINT DIGITAL DATA TRANSMISSION SYSTEM EMPLOYING PULSE MODULATED INFRARED OR LIGHT BEAMS THE SYSTEM INCLUDES A PAIR OF OPTICAL TRANSCIEVER UNITS WHICH LINK ONE COMPUTER INSTALLATION TO ANOTHER VIA LINE OF SIGHT COMMUNICATIONS. THE SYSTEM ALSO INCLUDES INTERFACE UNITS CONNECTING RESPECTIVE OPTICAL UNITS TO THEIR ASSOCIATED COMPUTER INSTALLATION. THE INTERFACE UNITS ENCODE, MODULATE, DEMODULATE AND TRANSFER RECIEVED DATA. THE SYSTEM INCLUDES MEANS TO AUTOMATICALLY SYNCHONIZE WIT H INCOMING DATA AND FURTHER PROVIDE A SOURCE OF SYNCHRONIZING SIGNALS FOR USE BY ASSOCIATED COMPUTER EQUIPMENT.
Inventors
- 👤 Ray W Sanders
- 👤 David W Luce
- 👤 William Quan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:53
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/07; H04B10/11; H04B10/112; H04B10/1123; H04B10/1125; H04B10/1127; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4902; H04L7/00; H04L7/02; H04L7/033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |