Panafacom Limited
24Patents
0Active
24Granted
29Portfolio score
Filing activity: Dec 18, 1975 → Nov 23, 1988
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4701846A | Computer system capable of interruption using special protection code for write interruption region of memory device | Physics | 67 | Expired |
| US4271466A | Direct memory access control system with byte/word control of data bus | Physics | 38 | Expired |
| US4788655A | Condition code producing system | Physics | 36 | Expired |
| US4849747A | Display data transfer control apparatus applicable for display unit | Physics | 35 | Expired |
| US4106104A | Data transferring system with priority control and common bus | Physics | 30 | Expired |
| US4803618A | Multiprocessor system having common memory | Physics | 23 | Expired |
| US4334269A | Data processing system having an integrated stack and register machine architecture | Physics | 23 | Expired |
| US4037211A | Address extending control unit | Physics | 21 | Expired |
| USD279190S | Keyboard | General | 17 | Expired |
| US4384342A | System for reducing access time to plural memory modules using five present-fetch and one prefetch address registers | Physics | 17 | Expired |
| USD280900S | Printer | General | 16 | Expired |
| US4644419A | Floppy disk unit | Physics | 16 | Expired |
| US4128881A | Shared memory access control system for a multiprocessor system | Physics | 15 | Expired |
| US4896257A | Computer system having virtual memory configuration with second computer for virtual addressing with translation error processing | Physics | 15 | Expired |
| US4837564A | Display control apparatus employing bit map method | Physics | 10 | Expired |
| US4827251A | Display control system with control of background luminance or color data | Physics | 10 | Expired |
| US4602330A | Data processor | Physics | 9 | Expired |
| US4471425A | A data transfer control system for multiple units on a common bus using a serially transmitted transfer permission signal | Physics | 8 | Expired |
| US4012593A | Bidirectional repeater in data transmission system | Electricity | 8 | Expired |
| US4079354A | Data processing system with improved read/write capability | Physics | 6 | Expired |
| USD279187S | Computer | General | 5 | Expired |
| US4801930A | Video information transfer processing system | Physics | 4 | Expired |
| USD279189S | Display | General | 3 | Expired |
| US4177451A | Data communication system | Electricity | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.