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| Number | Title | Issue Date |
| 4609963 | Spindle aperture reinforcement for a floppy disk An improved reinforcement member for a central aperture in a flexible recording disk and a method for forming the same. The improved reinforcement comprises an integral, annular-shaped ring formed on one or both sides of the flexible recording disk about ... | 09/02/1986 |
| 4480282 | Stabilized locating ring for a flexible disk An improved magnetic flexible disk for use in data storage is provided with a stabilized locating ring about the spindle aperture thereof. The stabilized locating ring is selected from an electrically conductive material having miniscule humidital expansi... | 10/30/1984 |
| 4387114 | Spindle aperture reinforcement for a floppy disk An improved reinforcement member for a central aperture in a flexible recording disk and a method for forming the same. The improved reinforcement comprises an integral, annular-shaped ring formed on one or both sides of the flexible recording disk about ... | 06/07/1983 |
