US3585505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Train-to-wayside communication system using trackside conductors
Assignee: British Railways Board
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Filing: 1968-11-25
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Granted: 1971-06-15
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Expires: 1988-11-25
Abstract
Abstract A track communication system for moving trains, has an open wire transmission line extending along the track comprising two insulated conductors, the characteristic impedance of the transmission line being maintained substantially constant by the presence of a sectionalized conductor adjacent one of the insulated conductors each section of which is short circuited to a conductor adjacent the other insulated conductor of the transmission line. In an alternative embodiment, one insulated conductor of the transmission line is replaced by a rail of the track to which each section of the sectionalized conductor is short circuited.
Inventors
- 👤 Harry Heggie Ogilvy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:15
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/225; B61L13/00; B61L13/04; B61L13/047
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
A train-wayside communication system for moving trains wherein an inductive coupling is established between the wayside and train for conveying information therebetween, said system including, an open wire transmission line extending along the track for carrying said information in the form of electric currents which produce a magnetic field for the inductive coupling of said information to said train and alternatively have electric currents induced therein by reason of a magnetic field for the inductive coupling of said information to the wayside, said open wire transmission line comprising a pair of insulated conductors each having a metal sheathing, the sheathing of each conductor being in sections insulated from each other and each section of sheathing of one conductor being short circuited to a section of sheathing of the other conductor.
Claim 2
Dependent Claim
130 words
A train-wayside communication system for moving trains wherein an inductive coupling is established between the wayside and train for conveying information therebetween, said system including, an open wire transmission line extending along the track for carrying said information in the form of electric currents which produce a magnetic field for the inductive coupling of said information to said train and alternatively have electric currents induced therein by reason of a magnetic field for the inductive coupling of said information to the wayside, said open wire transmission line comprising a pair of insulated conductors each having a metal sheathing, the sheathing of each conductor being in sections insulated from each other and each section of sheathing of one conductor being short circuited to a section of sheathing of the other conductor.
Claim 3
Dependent Claim
124 words
A train-wayside communication system for moving trains wherein an inductive coupling is established between the wayside and train for conveying information therebetween, said system including an open wire transmission line extending along the track for carrying said information in the form of electric currents which produce a magnetic field for the inductive coupling of said information to said train and alternatively have electric currents induced therein by reason of a magnetic field for the inductive coupling of said information to the wayside, said open wire transmission line comprising an insulated conductor together with one rail of the track, said insulated conductor having a metal sheathing which is in sections insulated from each other, the sections of said sheathing being short circuited to the rail.
Claim 4
Dependent Claim
124 words
A train-wayside communication system for moving trains wherein an inductive coupling is established between the wayside and train for conveying information therebetween, said system including an open wire transmission line extending along the track for carrying said information in the form of electric currents which produce a magnetic field for the inductive coupling of said information to said train and alternatively have electric currents induced therein by reason of a magnetic field for the inductive coupling of said information to the wayside, said open wire transmission line comprising an insulated conductor together with one rail of the track, said insulated conductor having a metal sheathing which is in sections insulated from each other, the sections of said sheathing being short circuited to the rail.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |