Magnetic tape cassette
US4289285A · kind A · utility
11Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1980 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | Apr 25, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/08764
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved magnetic tape cassette and separation sheet therefor. The separation sheet, positioned between an inner wall and the tape reels of a cassette, is formed with at least one dome-like protrusion. A plurality of such protrusions are preferably utilized spaced throughout the sheet, each of a diameter R and height H sized to provide an R/H ratio of between about 100 and 10. The separation sheet may be formed with a protrusion shaped to fit into a window in an inner case wall, the window-fitting protrusion extending from a side of said separation sheet opposite from that containing said dome-like protrusions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.