Patent US3554798A successfully refreshed from Google Patents.
US3554798A
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US
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Magnetic recording members
Assignee: EIDP Inc
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Filing: 1969-06-17
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Granted: 1971-01-12
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Expires: 1989-06-17
Abstract
Abstract A MAGNETIC RECORDING MEMBER PARTICULARLY ADAPTED FOR USE IN THERMOMAGNETIC RECORDING AND COPYING HAVING HARD MAGNETIC MATERIAL SUCH AS CRO2 DISCRETELY BUT REGULARLY DISPOSED IN THE SURFACE OF A TRANSPARENT, USUALLY PLASTIC SUPPORT. THE MAGNETIC MATERIAL IS DISCRETELY DISPOSED IN THE FORM OF THREE-DIMENSIONAL "DOTS" AND "LINES" OR OTHER REGULAR PATTERNS TO PROVIDE THE ESSENTIAL TRANSPARENCY TO LIGHT. D R A W I N G
Inventors
- 👤 George Raymond Nacci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:21
CPC Classifications
G; G03; G03G; G03G19/00; B; B41; B41M; B41M5/00; B41M5/26; G03G5/00; G03G5/16
Claims Analysis
Total Claims: 0
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References 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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |