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US4133504A
Expired / Lapsed
US
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System for protected data transmission to track-bound vehicles
Assignee: International Standard Electric Corp
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Filing: 1977-09-02
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Granted: 1979-01-09
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Expires: 1997-09-02
Abstract
Abstract The specification discloses a system for protected data transmission between a control center and a plurality of track-bound vehicles. The data is not acknowledged as correct until it is contained in two successive data messages which are compared. The comparison indicates whether the difference between the two successive messages is within predetermined limits.
Inventors
- 👤 Karl-Ulrich Dobler
- 👤 Richard Spannagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:48
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/08; B; B61; B61L; B61L17/00; G; G06; G06F; G06F11/00; G06F11/07; G06F11/14; G06F11/1402
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
A system for reliable data transmission comprising: (a) means for repeatedly transmitting data messages; (b) means for receiving said messages; (c) means connected to said receiving means for evaluating said messages for error, said last named means including comparison means for comparing one of said transmitted messages with at least one of said subsequently transmitted messages; (d) storage means for storing said data messages, said storage means includes an input storage means for storing a message; intermediate storage means connected to said input storage means for storing a message received prior to receipt of the message stored in said input storage means; and output storage means for storing a message determined to be free of error by said comparison means; and (e) control means connected to said storage means and to said comparison means, said control means controlling said storage means to read from said storage means a message upon indication from said comparison means that said message is free of error.
Claim 2
Independent Claim
162 words
A system for reliable data transmission comprising: (a) means for repeatedly transmitting data messages; (b) means for receiving said messages; (c) means connected to said receiving means for evaluating said messages for error, said last named means including comparison means for comparing one of said transmitted messages with at least one of said subsequently transmitted messages; (d) storage means for storing said data messages, said storage means includes an input storage means for storing a message; intermediate storage means connected to said input storage means for storing a message received prior to receipt of the message stored in said input storage means; and output storage means for storing a message determined to be free of error by said comparison means; and (e) control means connected to said storage means and to said comparison means, said control means controlling said storage means to read from said storage means a message upon indication from said comparison means that said message is free of error.
Claim 3
Dependent Claim
39 words
The system of claim 1, wherein said control means includes signal generating means for generating control signals to transfer the data messages from said input storage means to said intermediate storage means and lastly, to said output storage means.
Claim 4
Dependent Claim
22 words
The system of claim 1, wherein said control means includes a switching means for transferring information from one storage means to another.
Claim 5
Dependent Claim
22 words
The system of claim 3, wherein said control means includes a clock means for generating clock pulses to control the switching means.
References Cited (Backward Citations)
US3737577A
Cited
US3794834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |