Patent US3191102A successfully refreshed from Google Patents.
US3191102A
Expired / Lapsed
US
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Method and apparatus for erasing recordings on magnetic tape and film
Assignee: Gevaert Photo Producten NV
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Filing: 1960-12-14
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Granted: 1965-06-22
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Expires: 1980-12-14
Abstract
No abstract record available.
Inventors
- 👤 Lambeir Silvaan Rene
- 👤 Vereycken Modest Charline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/024; G11B5/0245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A BULK ERASER FOR ERASING MAGNETIC TAPE AND FILM COMPRISING ELECTROMAGNETIC COILS PROVIDED AROUND IRON CORE PORTIONS, SAID COILS BEING ELECTRICALLY CONNECTED TO ACT UPON EACH OTHER BY A HIGH MUTUAL INDUCTANCE WHEN SUPPLIED BY AN ALTERNATING CURRENT SOURCE, TO PRODUCE UNORDERED ASYMMETRIC ERASING FIELDS.
Claim 2
Dependent Claim
45 words
A BULK ERASER FOR ERASING MAGNETIC TAPE AND FILM COMPRISING ELECTROMAGNETIC COILS PROVIDED AROUND IRON CORE PORTIONS, SAID COILS BEING ELECTRICALLY CONNECTED TO ACT UPON EACH OTHER BY A HIGH MUTUAL INDUCTANCE WHEN SUPPLIED BY AN ALTERNATING CURRENT SOURCE, TO PRODUCE UNORDERED ASYMMETRIC ERASING FIELDS.
References Cited (Backward Citations)
US2895016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |