US3970784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission system
Assignee: Thales Nederland BV
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Filing: 1974-04-18
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Granted: 1976-07-20
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Expires: 1994-04-18
Abstract
Abstract Transmission system provided with two communication units in a closed electric circuit, each unit consisting of a driver circuit and a receiver circuit each provided with optically coupled isolators to secure said system from the disadvantageous influences due to a common-mode voltage between said units.
Inventors
- 👤 Hermanus Martinus Meijerink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:38
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/80; H04B10/801; H04B10/802; H04B3/00; H04B3/50; H04L; H04L25/00; H04L25/02; H04L25/08; H04L25/20; H04L25/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A transmission system comprising: a transmission line; a unidirectional power supply and two communication units connected in series with said transmission line; each unit including a driver circuit and a receiver circuit; at least one driver circuit including a photosensitive electronic device connected in the transmission line and a light emitting electronic device optically coupled to said photosensitive device; at least one receiver circuit including a light emitting electronic device connected in the transmission line; and control means coupled to each driving circuit for controlling conductive condition of the photosensitive device in said one driving circuit and for maintaining conductive condition in the other driving circuit.
Claim 2
Dependent Claim
106 words
A transmission system comprising: a transmission line; a unidirectional power supply and two communication units connected in series with said transmission line; each unit including a driver circuit and a receiver circuit; at least one driver circuit including a photosensitive electronic device connected in the transmission line and a light emitting electronic device optically coupled to said photosensitive device; at least one receiver circuit including a light emitting electronic device connected in the transmission line; and control means coupled to each driving circuit for controlling conductive condition of the photosensitive device in said one driving circuit and for maintaining conductive condition in the other driving circuit.
Claim 3
Dependent Claim
27 words
A transmission system as claimed in claim 1 wherein the control means in said one driving circuit controls the light emission of the associated light emitting device.
Claim 4
Dependent Claim
52 words
A transmission system as claimed in claim 2 wherein said control means includes first gating means coupled to said one driving means and activated by the transmission signal and by a binary control signal and second gating means coupled to the other driving means and activated by an inverse binary control signal.
Claim 5
Dependent Claim
27 words
A transmission system as claimed in claim 1 wherein each receiver circuit and each driver circuit includes a photosensitive device optically coupled to said light emitting device.
References Cited (Backward Citations)
US2383788A
Cited
US3808366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |