Patent US3400309A successfully refreshed from Google Patents.
US3400309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic silicon device containing dielectrically isolatng film of silicon carbide
Assignee: International Business Machines Corp
•
Filing: 1965-10-18
•
Granted: 1968-09-03
•
Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Ven Y Doo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:24
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/6903; H10P14/6905; H10P14/63; H10P14/6326; H10P14/6349; H10P95/00; H10W; H10W10/00; H10W10/01; H10W10/011; H10W10/019; H10W10/10; H10W74/00; H10W74/40; H10P14/66; H10P14/662; Y; Y10; Y10S; Y10S148/00; Y10S148/043; Y10S148/05; Y10S148/085; Y10S148/148
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |