Patent US3102170A successfully refreshed from Google Patents.
US3102170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for selectively erasing two or more adjacent magnetic tracks of a magnetic tape
Assignee: US Philips Corp
•
Filing: 1960-02-10
•
Granted: 1963-08-27
•
Expires: 1980-02-10
Abstract
No abstract record available.
Inventors
- 👤 Koning Cornelis De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A DEVICE FOR SELECTIVELY ERASING A PLURALITY OF SIGNAL TRACKS ARRANGED ADJACENT TO EACH OTHER ON A MAGNETIC TAPE BY MEANS OF A PLURALITY OF ERASING HEADS, THE GAPS OF THE HEADS BEING ALIGNED IN A DIRECTION TRANSVERSE TO THE TAPE, EACH HEAD BEING COUPLED TO A SEPARATE ASSOCIATED TRACK, EACH HEAD HAVING THREE MAGNETIC LEGS INCLUDING TWO OUTER LEGS AND ONE INNER LEG AND WINDINGS COUPLED TO SELECTED LEGS, THE WINDINGS ON ONE HEAD BEING WOUND ON THE TWO OUTER LEGS ONLY AND THE WINDINGS ON AN ADJACENT HEAD BEING WOUND ON THE INNER LEG ONLY, THE MAGNETIC FLUX IN THE TWO OUTER LEGS OF SAID ONE HEAD BEING IN THE OPPOSITE DIRECTIONS WHILE THE MAGNETIC FLUX IN THE TWO OUTER LEGS OF THE ADJACENT HEAD IS IN THE SAME DIRECTION.
Claim 2
Independent Claim
132 words
A DEVICE FOR SELECTIVELY ERASING A PLURALITY OF SIGNAL TRACKS ARRANGED ADJACENT TO EACH OTHER ON A MAGNETIC TAPE BY MEANS OF A PLURALITY OF ERASING HEADS, THE GAPS OF THE HEADS BEING ALIGNED IN A DIRECTION TRANSVERSE TO THE TAPE, EACH HEAD BEING COUPLED TO A SEPARATE ASSOCIATED TRACK, EACH HEAD HAVING THREE MAGNETIC LEGS INCLUDING TWO OUTER LEGS AND ONE INNER LEG AND WINDINGS COUPLED TO SELECTED LEGS, THE WINDINGS ON ONE HEAD BEING WOUND ON THE TWO OUTER LEGS ONLY AND THE WINDINGS ON AN ADJACENT HEAD BEING WOUND ON THE INNER LEG ONLY, THE MAGNETIC FLUX IN THE TWO OUTER LEGS OF SAID ONE HEAD BEING IN THE OPPOSITE DIRECTIONS WHILE THE MAGNETIC FLUX IN THE TWO OUTER LEGS OF THE ADJACENT HEAD IS IN THE SAME DIRECTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |