Method and apparatus for manufacturing magnetic recording tape
Abstract
Abstract A METHOD OF MANUFACTURING MAGNETIC RECORDING TAPE HAVING AT LEAST TWO TRACKS WHICH ARE TRANSVERSELY ORIENTED WITH RESPECT TO EACH OTHER COMPRISES COATING A TAPE WEB AND THEN PASSING THE WET COATING THROUGH A SPECIAL MAGNET HAVING A PAIR OF OPPOSED ZIGZAG GAPS WHICH PRODUCES A MAGNETIC FIELD HAVING LONGITUDINALLY DIRECTED AND TRANSVERSELY DIRECTED PORTIONS. THE COATING IS THEN SOLIDIFIED AND THE WEB SLIT INTO TAPES. THE MAGNET FOR ORIENTING THE MAGNETIC PARTICLES COM- PRISES A CORE HAVING A LONGITUDINAL AXIS AND TWO SPACED CONFRONTING PORTIONS ON EACH SIDE OF THE AXIS. EACH OF THE PORTIONS HAVE TWO PIECES AND ARE SPACED TO PROVIDE A GAP OF A PREDETERMINED DISTANCE. THE GAPS DESCRIBE ZIGZAG COURSES IN THE TRANSVERSE DIRECTION TO THE AXIS AND THE GAPS ARE OPPOSED TO ONE ANOTHER. THE APPARATUS INCLUDES MEANS FOR INDUCING MAGNETIC FLUX IN EACH OF THE CONFRONTING PORTIONS.
Inventors
- 👤 David F Martin
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |