Hitachi Chubu Software, Ltd.
13Patents
0Active
13Granted
34Portfolio score
Filing activity: Jun 2, 1988 → Jan 30, 1997
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5465299A | Electronic document processing system and method of forming digital signature | Electricity | 296 | Expired |
| US5379423A | Information life cycle processor and information organizing method using it | Emerging Cross-Sectional Technologies | 87 | Expired |
| US5309516A | Group cipher communication method and group cipher communication system | Electricity | 64 | Expired |
| US5222139A | Cryptographic method and apparatus | Electricity | 43 | Expired |
| US5708827A | Spread sheet calculation method and apparatus by extracting an area to be updated by a calculation formula | Physics | 41 | Expired |
| US5781434A | Control system for communication apparatus | Emerging Cross-Sectional Technologies | 31 | Expired |
| US5218638A | Encipher method and decipher method | Electricity | 30 | Expired |
| US4984195A | Extended bus controller | Physics | 28 | Expired |
| US5572701A | Bus snoop method and apparatus for computer system having CPU with cache and main memory unit | Physics | 25 | Expired |
| US6105138A | Method and apparatus for controlling electric source in information processing system | Physics | 17 | Expired |
| US5353403A | Graphic display processing apparatus and method for improving the speed and efficiency of a window system | Physics | 16 | Expired |
| US5351294A | Limited broadcast system | Electricity | 10 | Expired |
| US5583985A | Graphic display processing apparatus for improving speed and efficiency of a window system | Physics | 9 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.