Hitachi Construction Machinery

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
 
 
G08B SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS 193

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7002465 Security system of construction machineExpiredApr 17, 02Feb 21, 06[G08B]
6327959 Directional control valve deviceExpiredJul 13, 00Dec 11, 01[F15B]
4788902 Thrust hydrostatic bearing device for use in axial piston machineExpiredAug 24, 87Dec 06, 88[F16C, F01B]

Top Inventors for This Owner

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