Joachim Hack
24Patents
9h-index
57Co-inventors
74Inventor score
Filing activity: Sep 19, 1974 → Nov 14, 1989
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4327139A | Rigid magnetic recording disk having perfluoropolyether lubricant | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4320171A | Magnetic recording media containing elastomeric polyurethane binders in the magnetic coating | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4157576A | Track-dependent transducer position control in magneto-dynamic storage devices, and a magnetic recording medium to which this method is applicable | Physics | 19 | Expired |
| US4514937A | Method for the surface treatment of magnetic recording media | Performing Operations; Transporting | 19 | Expired |
| US4084201A | Magnetic disc, especially a flexible magnetic disc, for track adjustment and amplitude control | Physics | 17 | Expired |
| US4346413A | Magnetic head positioning servo arrangement for a system for recording/reproducing information on a magnetic recording medium, particularly on a flexible magnetic recording medium | Physics | 17 | Expired |
| US5050015A | Method and arrangement for reducing wear in a magnetic storage means | Physics | 11 | Expired |
| US4074002A | Magnetic recording media having a low coefficient of friction | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4018968A | Coated magnetic recording media | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4396886A | Document authentication by means of exchange-anisotropic magnetic material | Physics | 9 | Expired |
| US4018967A | Magnetic recording tape | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5084319A | Disk-shaped magnetic recording media, their production and information stores containing these recording media | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4623942A | Method and arrangement for detecting error signals in a disk-drive, and a magnetic test disk therefor | Physics | 8 | Expired |
| US4303951A | Device for compensating unequal write fields in magnetic data-storage devices, especially in disc memories | Physics | 4 | Expired |
| US4430678A | Drive apparatus for recording disks in which the disk is clamped between a driven recessed member and a rotatably mounted clamping member | Physics | 4 | Expired |
| US4796137A | Protective jacket for a disk-shaped recording medium | Physics | 4 | Expired |
| US4597990A | Preparation of magnetic recording media | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4534999A | Production of magnetic recording media having a backing coating | Physics | 3 | Expired |
| US4438462A | Document identification employing exchange-anisotropic magnetic material | Physics | 3 | Expired |
| US4891114A | Magnetic recording media | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4000336A | Production of magnetic recording media | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4626944A | Positioning device for scanning means in a disk drive unit | Physics | 1 | Expired |
| USRE29049E | Tape recorder and magnetic tape cassette with movable tensioning and brake means | General | 1 | Expired |
| US4551359A | Production of magnetic recording media | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.