Archive Corporation
39Patents
0Active
39Granted
36Portfolio score
Filing activity: Oct 8, 1981 → Sep 2, 1993
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5386545A | Target management method for data backup to a shared transfer station, multiple media element device | Emerging Cross-Sectional Technologies | 131 | Expired |
| US4833418A | Compensation circuit for nullifying differential offset voltage and regulating common mode voltage of differential signals | Electricity | 113 | Expired |
| US5285333A | Mass storage and retrieval system for magnetic tape cartridges | Physics | 51 | Expired |
| US5006819A | Track and hold phase locked loop circuit | Electricity | 50 | Expired |
| US5157564A | Storage module changer for a computer data storage drive | Physics | 47 | Expired |
| US5182687A | Method and apparatus for aligning cartridges with a cartridge insertion slot | Physics | 40 | Expired |
| US5163136A | System for assembling playback data frames using indexed frame buffer group according to logical frame numbers in valid subcode or frame header | Physics | 36 | Expired |
| US5371636A | Mechanisms for a closed loop head positioner for streaming tape drives | Physics | 35 | Expired |
| US5253126A | Raw error monitoring and reporting | Physics | 35 | Expired |
| US4644420A | Circuit and methodology for reading and tracking binary data from magnetic tape independently of the data pattern on the tape | Physics | 33 | Expired |
| US5191492A | Mechanisms for a closed loop head positioner for streaming tape drives | Physics | 33 | Expired |
| US5050020A | Cartridge loader for loading each of a plurality of cartridges into a cartridge insertion slot | Physics | 31 | Expired |
| US5109308A | Stationary head tape drive with a movable door opening mechanism | Physics | 25 | Expired |
| US4858039A | Streaming tape drive with direct block addressability | Physics | 22 | Expired |
| US4466027A | Digital tape erasure conditioning system | Physics | 20 | Expired |
| US4414593A | Streaming cartridge tape drive | Physics | 18 | Expired |
| US4833558A | Head positioning assembly | Physics | 18 | Expired |
| US5237469A | Stationary head cartridge tape drive with moveable x-y table and method | Physics | 17 | Expired |
| US4978955A | Data randomizing/de-randomizing circuit for randomizing and de-randomizing data | Electricity | 16 | Expired |
| US5101311A | Tape and mechanism protection methods for DAT drives | Physics | 15 | Expired |
| US5001580A | Method to compensate for tape slope and head azimuth errors | Physics | 14 | Expired |
| US5255130A | Adjustable write equalization for tape drives | Physics | 14 | Expired |
| US4747004A | Magnetic head positioning apparatus | Physics | 14 | Expired |
| US5081547A | Apparatus and method for automatic adjustment of read amplitude threshold in a digital tape drive | Physics | 13 | Expired |
| US5172280A | Apparatus and method for automatic write current calibration in a streaming tape drive | Physics | 13 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.