M4 Data Limited
4Patents
0Active
4Granted
22Portfolio score
Filing activity: Dec 24, 1990 → Nov 2, 1995
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5652682A | Apparatus for loading and unloading cartridges | Physics | 11 | Expired |
| US5353179A | Auto-loading of tape cartridges | Physics | 11 | Expired |
| US5515213A | Tape drive machine for selectively reading a plurality of recording tape cartridges | Physics | 8 | Expired |
| US5227935A | Tape drive having a selectively retractable drive hub | Physics | 3 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.