Japanese National Railways

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4794530 Credit settlement and ticketing terminal systemExpiredMay 07, 86Dec 27, 88[G07F]
4776283 Truck for railway vehicleExpiredNov 14, 86Oct 11, 88[B61F]
4760900 Friction brakesExpiredMar 12, 81Aug 02, 88[F16D]
4746143 Vibration control apparatus for vehiclesExpiredJan 29, 87May 24, 88[B60G]
4715289 Apparatus for controlling vibration of vehicleExpiredMay 29, 86Dec 29, 87[B61F]
4696446 System for detecting flat portion of peripheral surface of vehicle wheelExpiredMar 20, 84Sep 29, 87[B61K, B61L]
4652495 Resilient coat for tie of direct-connection type trackExpiredJan 31, 86Mar 24, 87[E01B, B32B]
4648224 Tendon for prestressed concreteExpiredMar 15, 85Mar 10, 87[E04C]
4630772 Insulating plate for rail insulated jointExpiredApr 04, 86Dec 23, 86[F01B]
4622664 Channel control system for loop type signal transmission channelExpiredOct 02, 84Nov 11, 86[H04J]
4576324 Gas pressure welding machineExpiredJan 23, 85Mar 18, 86[B23K]
4557087 Metallic sheath for a posttensioning method provided with rust proofing treatmentExpiredSep 01, 83Dec 10, 85[E04C]
4556164 Method of field welding head-hardened railsExpiredFeb 19, 85Dec 03, 85[B23K, E01B]
4520756 Build-up spraying apparatusExpiredJun 20, 84Jun 04, 85[B05B]
4468572 Feeder voltage compensating apparatus for electric railwayExpiredOct 15, 82Aug 28, 84[H02J]
4459668 Automatic train control deviceExpiredMar 10, 81Jul 10, 84[B61L, G06F]
4454389 Lambda type direct suspending overhead contact system for electric railwayExpiredJul 01, 81Jun 12, 84[B60M]
4436179 Noise control apparatusExpiredDec 30, 81Mar 13, 84[G10K]
4436313 Device for sealing a propeller shaft against invasion of sea waterExpiredApr 30, 82Mar 13, 84[F16J]
4416158 Punching-shearing method for inspecting quality of butt welded jointExpiredFeb 03, 82Nov 22, 83[G01N]

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