42 US patents granted on 12 May 2009 and assigned to Hitachi
| 1 | D592,028 | Portable electric hammer drill |
| 2 | 7,533,269 | Digital-signed digital document exchange supporting method and information processor |
| 3 | 7,532,973 | Control apparatus of direct injection internal combustion engine |
| 4 | 7,532,967 | Excavation teaching apparatus for construction machine |
| 5 | 7,532,946 | Chemical substance total management system, storage medium storing chemical substance management program and chemical substance total management method |
| 6 | 7,532,624 | Multicast packet control apparatus |
| 7 | 7,532,606 | DTMF signal transmission method and communication apparatus |
| 8 | 7,532,442 | Magnetoresistive (MR) elements having pinning layers formed from permanent magnetic material |
| 9 | 7,532,441 | MR read head with first and second gap layers |
| 10 | 7,532,436 | Magnetic recording medium and magnetic memory device for high density recording |
| 11 | 7,532,433 | Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using it |
| 12 | 7,532,432 | Perpendicular magnetic recording system with medium having thin soft underlayer and recording head having thick-throat trailing shield |
| 13 | 7,532,426 | Method for erase process on recording surface of disk and disk drive apparatus |
| 14 | 7,532,424 | Method of writing pattern on media and data storage device |
| 15 | 7,532,407 | Projection display |
| 16 | 7,532,328 | Circuit-pattern inspection apparatus |
| 17 | 7,532,274 | Liquid crystal display and display |
| 18 | 7,532,228 | Method for setting laser power in optical disc drive |
| 19 | 7,532,153 | Velocity sensor and ground vehicle velocity sensor using the same |
| 20 | 7,531,963 | Plasma display panel with insulation layer having projections |
| 21 | 7,531,962 | Flat panel display formed by tetragonal first and second substrates |
| 22 | 7,531,952 | Display panel device |
| 23 | 7,531,934 | Self-start synchronous motor with permanent magnets and at least one frictional agitation joint, method for manufacturing the same and compressor comprising the same |
| 24 | 7,531,907 | System and method for forming serial numbers on HDD wafers |
| 25 | 7,531,853 | Semiconductor device and manufacturing method of the same |
| 26 | 7,531,816 | Vacuum conveying apparatus and charged particle beam equipment with the same |
| 27 | 7,531,799 | Charged particle beam column |
| 28 | 7,531,767 | Method and apparatus for laser perforating printed circuit board |
| 29 | 7,531,467 | Manufacturing method of semiconductor device and substrate processing apparatus |
| 30 | 7,531,052 | Steel strip for razor blades and method of manufacturing the same |
| 31 | 7,531,036 | Single crystal heat treatment method |
| 32 | 7,530,835 | Electronic module |
| 33 | 7,530,819 | Device for controlling a vehicle |
| 34 | 7,530,506 | Fuel injection value |
| 35 | 7,530,418 | Construction machine |
| 36 | 7,530,359 | Plasma treatment system and cleaning method of the same |
| 37 | 7,530,347 | Air amount computing unit and fuel control unit of internal combustion engine |
| 38 | 7,530,305 | Molding material transfer method and substrate structure |
| 39 | 7,530,252 | Method and apparatus for working tube |
| 40 | 7,530,160 | Method for manufacturing a magnetoresistive sensor having improved antiparallel tab free layer biasing |
| 41 | 7,530,159 | Method of distortion correction in shrink processes for fabrication of write poles |
| 42 | 7,530,158 | CPP read sensor fabrication using heat resistant photomask |
