Patent US3412456A successfully refreshed from Google Patents.
US3412456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production method of semiconductor devices
Assignee: Hitachi Ltd
•
Filing: 1965-12-09
•
Granted: 1968-11-26
•
Expires: 1985-12-09
Abstract
No abstract record available.
Inventors
- 👤 Ebisawa Yasuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:54
CPC Classifications
H; H10; H10P; H10P95/00; F; F16; F16D; F16D33/00; F16D33/06; F16D33/08; F16D33/14; H10P76/00; H10P76/20; H10P76/202; H10W; H10W20/00; H10W20/40; H10W72/00; H10W72/071; H10W72/075; H10W72/07531; H10W72/07532; H10W72/50; H10W72/531; H10W72/5363; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/59; H10W72/90; H10W72/931; H10W72/934; H10W72/951; H10W72/952; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10S438/00; Y10S438/942; Y10S438/948; Y10S438/951
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2849583A
Cited
US2879188A
Cited
US2994621A
Cited
US2969296A
Cited
US3087239A
Cited
US3230109A
Cited
US3170810A
Cited
US3281815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |