US2900531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field-effect transistor
Assignee: RCA Corp
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Filing: 1957-02-28
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Granted: 1959-08-18
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Expires: 1977-02-28
Abstract
No abstract record available.
Inventors
- 👤 Wallmark John Torkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:34
CPC Classifications
H; H10; H10D; H10D30/00; H10D30/60; H10D30/67; H03; H03F; H03F3/00; H03F3/04; H03F3/16; H10D10/00; H10D62/00; H10D62/01; H10D99/00; H10P; H10P95/00; H10P95/50; H10W; H10W42/00; H10W72/00; H10W72/071; H10W72/075; H10W72/07551; H10W72/07554
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) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |