US3539839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor memory device
Assignee: NEC Corp
•
Filing: 1967-01-26
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Granted: 1970-11-10
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Expires: 1987-01-26
Abstract
No abstract record available.
Inventors
- 👤 Ryo Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:08
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/353; H03K3/356; H03K3/356017; H03K3/356052; H03K3/35606; G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/41; G11C11/412; H10; H10D; H10D84/00; H10D84/80; H10D84/82; H10D84/83; H10D84/8311; H10D84/83138; Y; Y10; Y10S; Y10S257/00; Y10S257/903; Y10S257/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3418493A
Cited
US3275908A
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US3191061A
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US3379941A
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US3321680A
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US3421026A
Cited
US3275996A
Cited
US3449594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |