Assignee
JAPAN NATIONAL RAILWAY
JP·41 granted patents·840 citations·filing 1974–1987
Top patents by PatentIndex Score
41 records- 0193US4459668AAutomatic train control deviceJAPAN NATIONAL RAILWAY·Filed 1981·Granted Jul 10, 1984·82 cites·7 claims
- 0288US4181430AMethod and apparatus for optical method of measuring rail displacementJAPAN NATIONAL RAILWAY·Filed 1976·Granted Jan 1, 1980·52 cites·9 claims
- 0388US4084981AQuick hardening cement-asphalt compositionJAPAN NATIONAL RAILWAY·Filed 1974·Granted Apr 18, 1978·31 cites·15 claims
- 0486US4060425ASuper rapid hardening mixtureJAPAN NATIONAL RAILWAY·Filed 1976·Granted Nov 29, 1977·51 cites·15 claims
- 0584US4052109AAir brake system employing combined automatic and direct brakingJAPAN NATIONAL RAILWAY·Filed 1976·Granted Oct 4, 1977·31 cites·4 claims
- 0684US4039297AHeat insulating particlesJAPAN NATIONAL RAILWAY·Filed 1975·Granted Aug 2, 1977·43 cites·5 claims
- 0782US4008093AControl method and equipment for charging ready-mixed concrete additives batchwiseJAPAN NATIONAL RAILWAY·Filed 1974·Granted Feb 15, 1977·40 cites·4 claims
- 0878US4299173ALevitation and guide mechanism for curved track in inductive repulsion type vehicle magnetic levitation and guide systemJAPAN NATIONAL RAILWAY·Filed 1979·Granted Nov 10, 1981·36 cites·10 claims
- 0978US4166509AProcess for excavating and constructing tunnel and excavating deviceJAPAN NATIONAL RAILWAY·Filed 1978·Granted Sep 4, 1979·17 cites·4 claims
- 1077US4652495AResilient coat for tie of direct-connection type trackJAPAN NATIONAL RAILWAY·Filed 1986·Granted Mar 24, 1987·45 cites·23 claims
- 1173US4273054AVehicle vibration damping method in the induced repulsion type magnetically suspended railway vehicleJAPAN NATIONAL RAILWAY·Filed 1977·Granted Jun 16, 1981·33 cites·10 claims
- 1269US3958701ALoad-shifting cargo transfer apparatusJAPAN NATIONAL RAILWAY·Filed 1974·Granted May 25, 1976·47 cites·1 claims
- 1368US4276572AAutomatic message announcement systemJAPAN NATIONAL RAILWAY·Filed 1979·Granted Jun 30, 1981·18 cites·14 claims
- 1467US4648224ATendon for prestressed concreteJAPAN NATIONAL RAILWAY·Filed 1985·Granted Mar 10, 1987·32 cites·3 claims
- 1563US4715289AApparatus for controlling vibration of vehicleJAPAN NATIONAL RAILWAY·Filed 1986·Granted Dec 29, 1987·21 cites·6 claims
- 1663US4436179ANoise control apparatusJAPAN NATIONAL RAILWAY·Filed 1981·Granted Mar 13, 1984·26 cites·7 claims
- 1761US4139320AProcess for excavating and constructing tunnel and excavating deviceJAPAN NATIONAL RAILWAY·Filed 1977·Granted Feb 13, 1979·10 cites·1 claims
- 1860US4307859AAutomatic message announcement systemJAPAN NATIONAL RAILWAY·Filed 1980·Granted Dec 29, 1981·32 cites·10 claims
- 1960US4013017ARemote railway container locking systemJAPAN NATIONAL RAILWAY·Filed 1975·Granted Mar 22, 1977·16 cites·8 claims
- 2057US4230209AMeans of stringing trolley wiresJAPAN NATIONAL RAILWAY·Filed 1978·Granted Oct 28, 1980·17 cites·5 claims
- 2156US4436313ADevice for sealing a propeller shaft against invasion of sea waterJAPAN NATIONAL RAILWAY·Filed 1982·Granted Mar 13, 1984·14 cites·9 claims
- 2250US4095764ASpot control type automatic train stop system utilizing ground control units common to more than one block signalJAPAN NATIONAL RAILWAY·Filed 1976·Granted Jun 20, 1978·13 cites·8 claims
- 2348US4156440ARailroad track bed using injection materials and method thereforJAPAN NATIONAL RAILWAY·Filed 1977·Granted May 29, 1979·13 cites·7 claims
- 2445US4146481AFilterJAPAN NATIONAL RAILWAY·Filed 1977·Granted Mar 27, 1979·11 cites·7 claims
- 2545US3986222AShock control device for use in the construction of buildings such as bridges and the likeJAPAN NATIONAL RAILWAY·Filed 1975·Granted Oct 19, 1976·15 cites·5 claims
- 2643US4267085AInjection materials for railroad track bedsJAPAN NATIONAL RAILWAY·Filed 1979·Granted May 12, 1981·10 cites·4 claims
- 2742US4746143AVibration control apparatus for vehiclesJAPAN NATIONAL RAILWAY·Filed 1987·Granted May 24, 1988·9 cites·7 claims
- 2840US4454389ALambda type direct suspending overhead contact system for electric railwayJAPAN NATIONAL RAILWAY·Filed 1981·Granted Jun 12, 1984·9 cites·5 claims
- 2938US4134342ABallast tamping apparatusJAPAN NATIONAL RAILWAY·Filed 1977·Granted Jan 16, 1979·10 cites·4 claims
- 3034US4557087AMetallic sheath for a posttensioning method provided with rust proofing treatmentJAPAN NATIONAL RAILWAY·Filed 1983·Granted Dec 10, 1985·6 cites·2 claims
- 3134US4556164AMethod of field welding head-hardened railsJAPAN NATIONAL RAILWAY·Filed 1985·Granted Dec 3, 1985·8 cites·6 claims
- 3234US4468572AFeeder voltage compensating apparatus for electric railwayJAPAN NATIONAL RAILWAY·Filed 1982·Granted Aug 28, 1984·11 cites·5 claims
- 3334US3998437AEquipment for charging ready-mixed concrete additives batchwiseJAPAN NATIONAL RAILWAY·Filed 1975·Granted Dec 21, 1976·5 cites·7 claims
- 3433US4272003AButt welding and burr shearing machine for reinforce steelJAPAN NATIONAL RAILWAY·Filed 1979·Granted Jun 9, 1981·4 cites·2 claims
- 3532US4520756ABuild-up spraying apparatusJAPAN NATIONAL RAILWAY·Filed 1984·Granted Jun 4, 1985·4 cites·19 claims
- 3632US4031990ASet of current collecting elements used for a current collecting rollerJAPAN NATIONAL RAILWAY·Filed 1975·Granted Jun 28, 1977·4 cites·9 claims
- 3731US4576324AGas pressure welding machineJAPAN NATIONAL RAILWAY·Filed 1985·Granted Mar 18, 1986·4 cites·4 claims
- 3829US4416158APunching-shearing method for inspecting quality of butt welded jointJAPAN NATIONAL RAILWAY·Filed 1982·Granted Nov 22, 1983·3 cites·2 claims
- 3924US4622664AChannel control system for loop type signal transmission channelJAPAN NATIONAL RAILWAY·Filed 1984·Granted Nov 11, 1986·3 cites·3 claims
- 4019US4327645ATie tamperJAPAN NATIONAL RAILWAY·Filed 1980·Granted May 4, 1982·2 cites·3 claims
- 4118US4323014ATie tamperJAPAN NATIONAL RAILWAY·Filed 1980·Granted Apr 6, 1982·2 cites·6 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →