Patent US2989650A successfully refreshed from Google Patents.
US2989650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor capacitor
Assignee: AT&T Inc
•
Filing: 1958-12-24
•
Granted: 1961-06-20
•
Expires: 1978-12-24
Abstract
No abstract record available.
Inventors
- 👤 Edward I Doucette
- 👤 Clarence J Spector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
H; H10; H10D; H10D1/00; H10D1/60; H10D1/62; H10D1/64; H10D10/00; H10D48/00; H10D48/30; H10D62/00; H10D62/10; H10D99/00; Y; Y10; Y10S; Y10S148/00; Y10S148/054
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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |