Patent US2734508A successfully refreshed from Google Patents.
Patent USRE28867E successfully refreshed from Google Patents.
USRE28867E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving object communication control system
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1973-02-05
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Granted: 1976-06-15
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Expires: 1993-02-05
Abstract
Abstract A communication system between mobile and wayside stations wherein the mobile stations are traveling on a track which is divided into sections by means of an open-type transmission line paralleling the track. A frequency selection and conversion device for each section of transmission line or track is connected to the transmission line to define the length of each section. A series of lower frequency carriers transmitted on the line are allotted respectively to each specific section of transmission line. These low-frequency carriers travel with a low loss along the transmission line and they are selected and converted by their respective frequency selection and converter device to a common high-frequency carrier signal for leaky transmission to a mobile station on the corresponding track section. These signals are used for train control and other communication signals may be transmitted on the same transmission line by a high-frequency carrier signal which is common to all sections, such that the common signal will leak from the transmission line for reception by a mobile station no matter its location on the track.
Inventors
- 👤 Takeshi Baba
- 👤 Kenji Shibuya
- 👤 Tetsuro Maruhama
- 👤 Tsuneo Nakahara
- 👤 Kenichi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:28
CPC Classifications
H; H04; H04B; H04B5/00; H04B5/20; H04B5/28; H04J; H04J1/00; H04J1/02; H04J1/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
A communication system between mobile and a wayside stations, said mobile stations traveling on a track divided in sections by means of an open-type transmission line paralleling the track, a frequency selection and conversion device for each section along said open-type transmission line and connected thereto at the proper position to define the length of each section, means to transmit a series of first lower frequency carriers on said open-type transmission line at a low loss from said wayside station, said carriers allotted respectively to each specific section of said open-type transmission line, said selection and conversion devices operable to select and convert their respective first lower frequency carrier to a first higher frequency carrier for leaky transmission from said transmission line to a mobile station on the corresponding track section, an antenna for each mobile station for receiving and transmitting signals to said open-type transmission line.
Claim 2
Dependent Claim
147 words
A communication system between mobile and a wayside stations, said mobile stations traveling on a track divided in sections by means of an open-type transmission line paralleling the track, a frequency selection and conversion device for each section along said open-type transmission line and connected thereto at the proper position to define the length of each section, means to transmit a series of first lower frequency carriers on said open-type transmission line at a low loss from said wayside station, said carriers allotted respectively to each specific section of said open-type transmission line, said selection and conversion devices operable to select and convert their respective first lower frequency carrier to a first higher frequency carrier for leaky transmission from said transmission line to a mobile station on the corresponding track section, an antenna for each mobile station for receiving and transmitting signals to said open-type transmission line.
Claim 3
Dependent Claim
58 words
The communication system of claim 1 wherein the frequency of said first higher frequency carrier is common to all sections of said open-type transmission line. .[.3. The communication system of claim 1 characterized by means to transmit at least one high-frequency carrier which is common to all of said sections from said wayside station or said mobile stations
Claim 4
Dependent Claim
35 words
on said open-type transmission line..]. 4. The communication system of claim .[.3.]. .Iadd.1 .Iaddend.characterized in that selected of said mobile stations are .Iadd.substituted by .Iaddend.stationary ground stations coupled through their corresponding of said frequency selection
Claim 5
Dependent Claim
99 words
and conversion devices directly to said transmission line. 5. The communication system of claim 1 .[.characterized by means on selected of said.]. .Iadd.wherein a .Iaddend.mobile .[.stations to transmit.]. .Iadd.station traveling along a track section transmits .Iaddend.at least one second higher frequency carrier .[.common to all of said sections.]. from its .[.respective.]. antenna to said transmission line.[.,.]. .Iadd.and .Iaddend.said conversion device for the corresponding track section of said open-type transmission line .[.being.]. .Iadd.is .Iaddend.operable to convert said carrier of second higher frequency to .[.a.]. .Iadd.the .Iaddend.second lower frequency .Iadd.allotted to said corresponding section on which said mobile station travels .Iaddend.for
Claim 6
Dependent Claim
48 words
transmission along said line at a low loss to said wayside station. 6. The communication system of claim .[.1.]. .Iadd.5 .Iaddend.characterized in that selected of said mobile stations are .Iadd.substituted by .Iaddend.stationary ground stations coupled through their corresponding of said frequency selection and conversion devices directly to said
Claim 7
Dependent Claim
11 words
transmission line. 7. The communication system of claim 1 wherein said
Claim 8
Dependent Claim
66 words
open-type transmission line is an open-type coaxial transmission line. 8. The communication system of claim 7 wherein said coaxial line has an outer conductor sheath with a longitudinal series of alternately slanted slots having a spacing pitch P, said lower frequency .[.carries.]. .Iadd.carriers .Iaddend.all having a frequency regulated by the condition ##EQU8## and said higher frequency carriers all having a frequency regulated by the condition ##EQU9##
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |