US3230515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin magnetic film memory structure
Assignee: Ampex Corp
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Filing: 1961-08-04
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Granted: 1966-01-18
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Expires: 1981-08-04
Abstract
No abstract record available.
Inventors
- 👤 Smaller Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:10
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0825
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
AN INFORMATION STORAGE DEVICE COMPRISING: A SUBSTRATE, AND A THIN FILM OF A MAGNETIC MATERIAL CAPABLE OF ASSUMING BISTABLE STATES OF MAGNETIC REMANENCE DEPOSITED ON THE SUBSTRATE AND ARRANGED TO EXHIBIT A PREFERRED DIRECTION OF MAGNETIZATION, SAID THIN FILM BEING ARRANGED IN A PREDETERMINED CONFIGURATION PROVIDING REPETITIVE VARIATIONS OF COERECIVE FORCE AS A FUNCTION OF DISTANCE ALONG THE FILM FOR SELECTIVELY CONFINING DOMAIN REORIENTATION IN RESPONSE TO AN APPLIED MAGNETIC FIELD.
Claim 2
Dependent Claim
71 words
AN INFORMATION STORAGE DEVICE COMPRISING: A SUBSTRATE, AND A THIN FILM OF A MAGNETIC MATERIAL CAPABLE OF ASSUMING BISTABLE STATES OF MAGNETIC REMANENCE DEPOSITED ON THE SUBSTRATE AND ARRANGED TO EXHIBIT A PREFERRED DIRECTION OF MAGNETIZATION, SAID THIN FILM BEING ARRANGED IN A PREDETERMINED CONFIGURATION PROVIDING REPETITIVE VARIATIONS OF COERECIVE FORCE AS A FUNCTION OF DISTANCE ALONG THE FILM FOR SELECTIVELY CONFINING DOMAIN REORIENTATION IN RESPONSE TO AN APPLIED MAGNETIC FIELD.
References Cited (Backward Citations)
US2919432A
Cited
US2984825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |