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Patent US3449643A successfully refreshed from Google Patents.
US3449643A
Expired / Lapsed
US
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Semiconductor integrated circuit device
Assignee: Hitachi Ltd
•
Filing: 1967-09-08
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Granted: 1969-06-10
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Expires: 1987-09-08
Abstract
No abstract record available.
Inventors
- 👤 Ichiro Imaizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:09
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/60; H10D84/67; H10D84/673; H10D84/01; H10D84/0112; H10D84/0119; H10D84/0121; H10D84/02; H10D84/03; H10D84/038; Y; Y10; Y10S; Y10S148/00; Y10S148/037; Y10S148/085; Y10S148/098; Y10S148/151
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3335341A
Cited
US3327182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |