Patent US3519899A successfully refreshed from Google Patents.
US3519899A
Expired / Lapsed
US
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Magneto-resistance element
Assignee: Sony Corp
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Filing: 1967-10-09
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Granted: 1970-07-07
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Expires: 1987-10-09
Abstract
No abstract record available.
Inventors
- 👤 Toshiyuki Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:33
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/40; H10D99/00; H10N; H10N52/00; H10N52/101; H10P; H10P95/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2790037A
Cited
US2976433A
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US3072803A
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US3158754A
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US3249764A
Cited
US3320568A
Cited
US3385981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |