US2852677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency negative resistance device
Assignee: AT&T Inc
•
Filing: 1955-06-28
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Granted: 1958-09-16
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Expires: 1975-06-28
Abstract
No abstract record available.
Inventors
- 👤 Shockley William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:38
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18; H03; H03B; H03B7/00; H03B7/02; H03B7/06; H10; H10D; H10D99/00; H10P; H10P95/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2569347A
Cited
US2681993A
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US2600500A
Cited
US2701309A
Cited
US2672528A
Cited
US2655610A
Cited
US2655608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |