US4081787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prioritied photo-isolated digital data transmission system
Assignee: United States Department of the Navy
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Filing: 1976-12-27
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Granted: 1978-03-28
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Expires: 1996-12-27
Abstract
Abstract A transmission system in which digital data from a transmitter is receivedy one of a plurality of photo-isolated receiver stages according to a predetermined sequence. The receiver stage having the least number of diode voltage drops receives the transmitted data, with the removal of the receiver stage with the least number of diode voltage drops causing reception by the receiver stage having the next least number of diode voltage drops.
Inventors
- 👤 Thomas W. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:06
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/26; H04L12/00; H04L12/28; H04L12/40; H04L2012/40267; H04L2012/4028
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A digital data transmission system comprising: (a) means for transmitting digital data; (b) means for distributing said digital data from said transmitting means; (c) a plurality of receiver stages connected in parallel to said distributing means, each of said receiver stages having a receiver circuit which is photo-isolated from said distributing means and having a unique total voltage potential drop; and (d) means for disconnecting each of said receiver stages from said distributing means; (e) whereby only said receiver stage having the smallest total voltage potential drop which is connected to said distributing means receives said digital data.
Claim 2
Dependent Claim
98 words
A digital data transmission system comprising: (a) means for transmitting digital data; (b) means for distributing said digital data from said transmitting means; (c) a plurality of receiver stages connected in parallel to said distributing means, each of said receiver stages having a receiver circuit which is photo-isolated from said distributing means and having a unique total voltage potential drop; and (d) means for disconnecting each of said receiver stages from said distributing means; (e) whereby only said receiver stage having the smallest total voltage potential drop which is connected to said distributing means receives said digital data.
Claim 3
Dependent Claim
53 words
A digital data transmission system as recited in claim 1 further comprising: (a) means located in each of said receiver stages for sending digital data to said transmitting means via said distributing means; and (b) means located at said transmitting means for receiving digital data from said sending means via said distributing means;
Claim 4
Dependent Claim
30 words
A digital data transmission system as recited in claim 2 further comprising means located at said transmitting means for determining from which sending means the digital data is being received.
Claim 5
Dependent Claim
33 words
A digital data transmission system as recited in claim 3 wherein said total voltage potential drop of each of said receiver stages comprises a function of the number of equivalent diodes in series.
Claim 6
Dependent Claim
46 words
A digital data transmission system as recited in claim 4 wherein the photo-isolation of said receiver circuit comprises a light-emitting diode (LED)/photodiode pair, the LED being connected in a line to said distributing means and the photodiode being connected to the input of said receiving circuit.
Claim 7
Dependent Claim
46 words
A digital data transmission system as recited in claim 4 wherein the photo-isolation of said receiver circuit comprises a light-emitting diode (LED)/phototransistor pair, the LED being connected in a line to said distributing means and the phototransistor being connected to the input of said receiving circuit.
References Cited (Backward Citations)
US3808366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |