Method of making a ferrite head
Abstract
Abstract A METHOD OF MANUFACTURING A FERRITE MAGNETIC HEAD, THE POLE TIPS BEING SEPARATED BY A GLASS-FILED GAP OF PREDETERMINED LENGTH, AT LEAST ONE OF THE FERRITE-GLASS INTERFACES HAVING BEEN PREPARED BY RADIO-FREQUENCY SPUTTERING OF GLASS ON THE FERRITE. THE METHOD INCLUDES THE FOLLOWING STEPS: (1) SPUTTERING A LAYER OF GLASS ON A PLURALITY UOF SELECTED PORTIONS OF A PLANAR SURFACE OF A FIRST FERRITE MEMBER? (2) APPLYING A LAYER OF A REFRACTORY MATERIAL ON OTHER PORTIONS OF SAID SURFACE ALTERNATING WITH SAID SELECTED PORTIONS, SAID LAYER OF REFRACTORY MATERIAL HAVING A THICKNESS EQUAL TO THE DESIRED GAP LENGTH? AND (3) FUSION BONDING SAID LAYER OF GLASS TO A PLANAR SURFACE OF A SECOND FERRITE MEMBER WHILE SAID LAYER OF REFRACTORY MATERIAL IS MAINTAINED IN CONTACT ENGAGEMENT WITH SAID SURFACE OF SAID SECOND MEMBER.
Inventors
- 👤 Franklin G Reade
- 👤 Tazzell Smith
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |