US3488167A
Expired / Lapsed
US
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Magnetic memory element with variable exchange coupling
Assignee: International Business Machines Corp
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Filing: 1967-07-06
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Granted: 1970-01-06
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Expires: 1987-07-06
Abstract
No abstract record available.
Inventors
- 👤 Hsu Chang
- 👤 David A Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10584; G11B11/10586; G11B5/62; G11B5/64; G11B5/66; G11B5/672; G11C; G11C11/00; G11C11/02; G11C11/14; G11C11/15; G11C13/00; G11C13/04; G11C13/06; G11B11/10502; G11B11/10515; G11B2005/0002; G11B2005/0005; G11B2005/0021; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12438; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3422407A
Cited
US3414891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |