Manufacture of abrasion-resistant magnetic recording media
Abstract
Abstract THE INVENTION RELATES TO A PROCESS FOR THE MANUFACTURE OF MAGNETIC RECORDING MEDIA HAVING THIN METALLIC FERROMAGNETIC COATINGS. THE MAGNETIC RECORDING MEDIA ARE MANUFACTURED BY TREATING A SUBSTRATE HAVING A COATING CONSISTING OF A DISPERSION OF PARTICULATE IRON OR ZINC IN A BINDER SUCH THAT ELECTROLESS DEPOSITION OF COPPER TAKES PLACE BY DISPLACEMENT OF THE IRON OR ZINC, WHICH COPPER COATING MAY BE THICKENED BY ELECTRODEPOSITING COPPER OR SILVER THEREON. A FERROMAGNETIC COATING CONSISTING OF COBALT AND NICKEL AND ADDITIONALLY PHOSPHORUS, COPPER OR ZINC AND/OR MANGANESE AND OPTIONALLY IRON IS ELECTRODEPOSITED ON THE COPPER LAYER. THE PROCESS OF THE INVENTION PRODUCES MAGNETIC RECORDING MEDIA WITH THIN METALLIC COATINGS OF HIGH ABRASION RESISTANCE WHICH CAUSE MINIMUM HEAD WEAR AND HAVE A HIGH STORAGE CAPACITY.
Inventors
- 👤 A Diebold
- 👤 R Sinn
- 👤 G Schnell
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |