US3471836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotational mode magnetic film memory
Assignee: AT&T Inc
•
Filing: 1964-12-03
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Granted: 1969-10-07
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Expires: 1984-12-03
Abstract
No abstract record available.
Inventors
- 👤 James L Smith
- 👤 Edward M Tolman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:27
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/04; G11C11/14; G11C11/15; G11C11/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3139608A
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US3213430A
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US3055770A
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US3233228A
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US3229265A
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US3348061A
Cited
US3278913A
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US3276000A
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US3375503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |