Double transfer curie-point and magnetic bias tape copy system
Abstract
Abstract METHOD AND SYSTEM IS DISCLOSED FOR COPYING MAGNETIC RECORDING, FOR EXAMPLE, ON A REGULAR MAGNETIC TAPE ONTO ANOTHER TAPE, FOR EXAMPLE, OF THE SAME TYPE, BY USING AN INTERMEDIARY CARRIER HAVING A RELATIVELY LOW CURIE POINT, PREFERABLY A LOWER CURIE POINT THAN THE MASTER TAPE, AND HAVING A ROOM TEMPERATURE COERCIVITY ABOVE THE COERCIVITY OF THE COPY TAPE. THE CONTENT OF THE MASTER TAPE IS PROGRESSIVELY COPIED ONTO THE INTERMEDIARY BY THERMOMAGNETIC TECHNIQUE AND AFTER COOLING, THE INFORMATION IS TRANSFERRED FROM THE INTERMEDIARY AGAIN PROGRESSIVELY TO THE COPY TAPE BY MAGNETIC HIGH-FREQUENCY BIAS SLOWLY DECAYING AS THE RESPECTIVE TAPE INCREMENT RECEDES FROM THE BIAS SOURCE.
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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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |