US3551760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device with an inversion preventing layer formed in a diffused region
Assignee: Hitachi Ltd
•
Filing: 1967-03-23
•
Granted: 1970-12-29
•
Expires: 1987-03-23
Abstract
No abstract record available.
Inventors
- 👤 Takashi Tokuyama
- 👤 Shigeru Nishimatsu
- 👤 Keijiro Uehara
- 👤 Takaaki Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:00
CPC Classifications
H; H10; H10D; H10D10/00; H10D1/00; H10D1/40; H10D48/00; H10D48/30; H10D48/38; H10D62/00; H10D62/10; H10D99/00; Y; Y10; Y10S; Y10S148/00; Y10S148/049
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-28 | 1974-06-29 | 1974-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-28 | 1978-06-29 | 1978-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-28 | 1982-06-29 | 1982-12-29 | $7700.00 | Window Closed / Lapsed |