Patent US3781687A successfully refreshed from Google Patents.
US3781687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wireless communication system for railway vehicle including an open type transmission line mounted on a radiowave absorbent support
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1970-12-28
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Granted: 1973-12-25
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Expires: 1990-12-28
Abstract
Abstract A communication system for eliminating interference in communications between a fixed station and a mobile vehicle. The fixed station includes a support base for supporting an open type transmission line, along the path of the mobile vehicle. The transmission line transmits radio waves from the fixed station and receives radio waves from the mobile vehicle. The mobile vehicle includes an antenna positioned to transmit radio waves from said mobile vehicle and to receive radio waves from the fixed station. The support base is positioned relative to the transmission line and the antenna, such that radio waves from the antenna not received by the transmission line and radio waves from the transmission line not received by the antenna and radio waves from other communication systems, are absorbed by the support base. The system may also include wave absorbing means positioned on the mobile vehicle to further reduce interference.
Inventors
- 👤 T Nakahara
- 👤 K Takemura
- 👤 M Kuroda
- 👤 N Kurauchi
- 👤 H Kitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
H; H04; H04B; H04B5/00; H04B5/20; H04B5/28; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/3208; H01Q1/3225
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
A wireless communication system for use with a mobile vehicle and a fixed station comprising: a. a radio wave absorbing support means comprising a concrete base positioned along the path of travel of said vehicle; b. an open type of transmission line means mounted on said support means for transmitting radio waves from said fixed station and for receiving radio waves from said mobile vehicle; and c. antenna means mounted on said mobile vehicle for transmitting radio waves from said mobile vehicle and for receiving radio waves from said fixed station wherein said support means absorbs electromagnetic energy radiated by said transmission line means and not incident upon said antenna and electromagnetic energy radiated by said antenna and not incident upon said transmission line means.
Claim 2
Dependent Claim
125 words
A wireless communication system for use with a mobile vehicle and a fixed station comprising: a. a radio wave absorbing support means comprising a concrete base positioned along the path of travel of said vehicle; b. an open type of transmission line means mounted on said support means for transmitting radio waves from said fixed station and for receiving radio waves from said mobile vehicle; and c. antenna means mounted on said mobile vehicle for transmitting radio waves from said mobile vehicle and for receiving radio waves from said fixed station wherein said support means absorbs electromagnetic energy radiated by said transmission line means and not incident upon said antenna and electromagnetic energy radiated by said antenna and not incident upon said transmission line means.
Claim 3
Dependent Claim
208 words
A wireless communication system for use with a mobile vehicle and a fixed station comprising: a. a radio wave absorbing support means comprising a concrete base positioned along the path of travel of said vehicle; b. an open type of transmission line means mounted on said support means for transmitting radio waves from said fixed station and for receiving radio waves from said mobile vehicle; c. antenna means mounted on said mobile vehicle for transmitting radio waves from said mobile vehicle and for receiving radio waves from said fixed station wherein said support means absorbs electromagnetic energy radiated by said transmission line means and not incident upon said antenna and electromagnetic energy radiated by said antenna and not incident upon said transmission line means; d. said support means comprising a base having a first outer surface and a second outer surface, said first outer surface being perpendicular to said second outer surface wherein said transmission line means is positioned below said first outer surface; e. said mobile vehicle including a third surface and a fourth surface wherein said third surface is parallel to said first outer surface and said fourth surface is parallel to said second outer surface; and f. said mobile vehicle further including wave absorbing means.
Claim 4
Dependent Claim
208 words
A wireless communication system for use with a mobile vehicle and a fixed station comprising: a. a radio wave absorbing support means comprising a concrete base positioned along the path of travel of said vehicle; b. an open type of transmission line means mounted on said support means for transmitting radio waves from said fixed station and for receiving radio waves from said mobile vehicle; c. antenna means mounted on said mobile vehicle for transmitting radio waves from said mobile vehicle and for receiving radio waves from said fixed station wherein said support means absorbs electromagnetic energy radiated by said transmission line means and not incident upon said antenna and electromagnetic energy radiated by said antenna and not incident upon said transmission line means; d. said support means comprising a base having a first outer surface and a second outer surface, said first outer surface being perpendicular to said second outer surface wherein said transmission line means is positioned below said first outer surface; e. said mobile vehicle including a third surface and a fourth surface wherein said third surface is parallel to said first outer surface and said fourth surface is parallel to said second outer surface; and f. said mobile vehicle further including wave absorbing means.
Claim 5
Dependent Claim
22 words
The system of claim 2 wherein said wave absorbing means are positioned on said third and fourth surfaces of said mobile vehicle.
Claim 6
Dependent Claim
20 words
The system of claim 2 wherein said wave absorbing means is positioned on said third surface of said mobile vehicle.
Claim 7
Dependent Claim
35 words
The system of claim 2 wherein said mobile vehicle includes a fifth surface means positioned parallel to and above said third surface and wherein said wave absorbing means is positioned on said fifth surface means.
Claim 8
Dependent Claim
32 words
The system of claim 2 wherein said mobile vehicle includes a sixth surface means parallel to said fourth surface and wherein said wave absorbing means is positioned on said sixth surface means.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |