US3472703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing semiconductor devices
Assignee: Hitachi Ltd
•
Filing: 1964-06-03
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Granted: 1969-10-14
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Expires: 1984-06-03
Abstract
No abstract record available.
Inventors
- 👤 Minoru Ono
- 👤 Takahisa Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:56
CPC Classifications
H; H10; H10D; H10D99/00; H10P; H10P95/00; H10P32/00; H10P32/10; H10P32/14; H10P32/1408; H10P32/141; H10P32/17; H10P32/171; Y; Y10; Y10S; Y10S148/00; Y10S148/045; Y10S438/00; Y10S438/91; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12674
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) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |