Hitachi Process Computer Engineering, Inc.
28Patents
0Active
28Granted
33Portfolio score
Filing activity: Feb 17, 1988 → Mar 24, 2004
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5432715A | Computer system and monitoring method | Physics | 235 | Expired |
| US5585821A | Apparatus and method for screen display | Physics | 168 | Expired |
| US5461501A | Liquid crystal substrate having 3 metal layers with slits offset to block light from reaching the substrate | Physics | 58 | Expired |
| US4887230A | Cursor display apparatus | Physics | 57 | Expired |
| US5651112A | Information processing system having performance measurement capabilities | Physics | 44 | Expired |
| US5396485A | Information communication system for point-to-point communication and point-to-multipoint communication using same lines | Electricity | 41 | Expired |
| US5274808A | Method and system for replacing program in uninterruptible computer system | Physics | 39 | Expired |
| US6216236A | Processing unit for a computer and a computer system incorporating such a processing unit | Physics | 31 | Expired |
| US5247619A | Insertion and removal of a circuit device into a bus network | Physics | 25 | Expired |
| US5210632A | Signal transmission system having a star coupled repeater | Electricity | 21 | Expired |
| US5890220A | Address conversion apparatus accessible to both I/O devices and processor and having a reduced number of index buffers | Physics | 18 | Expired |
| US5901281A | Processing unit for a computer and a computer system incorporating such a processing unit | Physics | 18 | Expired |
| US6034749A | Light insensitive type active matrix with P and N regions connected to a reference potential | Physics | 16 | Expired |
| US5787464A | Computer system including a dual memory configuration which supports on-line memory extraction and insertion | Physics | 11 | Expired |
| US5343009A | Data processing device and plug-in package | Emerging Cross-Sectional Technologies | 10 | Expired |
| US5497374A | Data transmission method and system thereof | Electricity | 9 | Expired |
| US5323173A | Display device | Physics | 9 | Expired |
| US5426638A | Transmission method and system thereof | Electricity | 7 | Expired |
| US6437842B1 | LCD and projection type display using three metalization layers and black layer | Physics | 7 | Expired |
| US6693691B2 | LCD and projection type display using same | Physics | 6 | Expired |
| US5706422A | Method of locating fault of communication system | Physics | 6 | Expired |
| US5418404A | Data processing device and plug-in package | Emerging Cross-Sectional Technologies | 6 | Expired |
| US6879358B2 | LCD and projection type display using same | Physics | 5 | Expired |
| US5740424A | Information processing system and method using time-varying database altering information | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4918561A | Housing for electronic apparatus | Electricity | 3 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.