Magnetic storage medium
Abstract
Abstract A MAGNETIZABLE STORAGE MEMBER IS FORMED FROM A SUBSTRATE AND THIN LAYERS DEPOSITED ON THE SUBSTRATE. THE FIRST THIN LAYER INCLUDES AN ELEMENT SUCH AS NICKEL HAVING HARD PROPERTIES. A THIN CHEMICALLY INERT LAYER SUCH AS GOLD MAY BE DISPOSED ON THE FIRST THIN LAYER. A THIRD VERY THIN LAYER OF COBALT IS DISPOSED ON THE GOLD LAYER OR DIRECTLY ON THE FIRST THIN LAYER. THE COBOLT HAS A HIGHER THICKNESS WHEN THE STORAGE MEMBER IS TO RECORD AND REPRODUCE DIGITAL INFORMATION. THE COBALT HAS A DECREASED THICKNESS WHEN THE STORAGE MEMBER IS TO RECORD AND REPRODUCE ANALOG INFORMATION HAVING RELATIVELY HIGH FREQUENCIES SUCH AS COLOR INFORMATION FOR A TELEVISION RECEIVER. A HARD, THIN, NONMAGNETIC PROTECTIVE COATING SUCH AS SILICONE MAY BE DISPOSED ON THE STORAGE MEMBER AND MAY BE MADE FROM A SILICONE.
Inventors
- 👤 Stanley S Nagy
- 👤 Floyd B Humphrey
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |