US3504430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making semiconductor devices having insulating films
Assignee: Hitachi Ltd
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Filing: 1967-06-13
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Granted: 1970-04-07
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Expires: 1987-06-13
Abstract
No abstract record available.
Inventors
- 👤 Seiji Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:03
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; H10D; H10D99/00; H10P; H10P14/00; H10P14/60; H10P14/63; H10P14/6302; H10P14/6304; H10P14/6306; H10P14/6308; H10P14/6309; H10P14/6322; H10P95/00; H10W20/01; H10W20/071; H10W20/081; H10W74/00; H10W74/40; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/053; Y10S148/114; Y10S148/163; Y10S438/00; Y10S438/981
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |