US3526844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic wave amplifier including a negative resistance semiconductor diode structure
Assignee: AT&T Inc
•
Filing: 1969-02-03
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Granted: 1970-09-01
•
Expires: 1989-02-03
Abstract
No abstract record available.
Inventors
- 👤 Dirk J Bartelink
- 👤 Basant R Chawla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:17
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62; H10; H10N; H10N80/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3350656A
Cited
US3401347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |