US3229273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic reproduce system and method
Assignee: Ampex Corp
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Filing: 1961-04-03
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Granted: 1966-01-11
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Expires: 1981-04-03
Abstract
No abstract record available.
Inventors
- 👤 Baaba Albert
- 👤 Donald F Eldridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:31
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/06; G02; G02B; G02B27/00; G02B27/28; G02F; G02F1/00; G02F1/01; G02F1/09; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10532; G11B11/10541; G11B11/10543; G11B11/10547; G11B5/00; G11B5/86; G11B5/865
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
APPARATUS FOR REPRODUCING INFORMATION REPRESENTED AS A MAGNETIC PATTERN ON A MOVING MAGNETIC TAPE, COMPRISING A SUPPORTING MEMBER, A THIN FILM OF FERROMAGNETIC MATERIAL ON ONE SURFACE OF SAID MEMBER, SAID FERROMAGNETIC MATERIAL HAVING A COERCIVE FORCE OF SUBSTANTIALLY LOWER VALUE THAN THAT OF THE FERROMAGNETIC MATERIAL OF THE MAGNETIC TAPE, SAID FILM BEING DISPOSED IN MAGNETICALLY COUPLED RELATION TO THE MAGNETIC FIELD ESTABLISHED BY THE MAGNETIC PATTERN ON SAID TAPE TO TRANSFER THE MAGNETIC PATTERN TO THE FILM, A PLANE POLARIZED LIGHT BEAM
Claim 2
Dependent Claim
84 words
APPARATUS FOR REPRODUCING INFORMATION REPRESENTED AS A MAGNETIC PATTERN ON A MOVING MAGNETIC TAPE, COMPRISING A SUPPORTING MEMBER, A THIN FILM OF FERROMAGNETIC MATERIAL ON ONE SURFACE OF SAID MEMBER, SAID FERROMAGNETIC MATERIAL HAVING A COERCIVE FORCE OF SUBSTANTIALLY LOWER VALUE THAN THAT OF THE FERROMAGNETIC MATERIAL OF THE MAGNETIC TAPE, SAID FILM BEING DISPOSED IN MAGNETICALLY COUPLED RELATION TO THE MAGNETIC FIELD ESTABLISHED BY THE MAGNETIC PATTERN ON SAID TAPE TO TRANSFER THE MAGNETIC PATTERN TO THE FILM, A PLANE POLARIZED LIGHT BEAM
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |