US2768328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency electronic device
Assignee: AT&T Inc
•
Filing: 1946-11-05
•
Granted: 1956-10-23
•
Expires: 1966-11-05
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:53
CPC Classifications
H; H03; H03C; H03C5/00; H03C5/02; H03C5/04; H01; H01J; H01J25/00; H01J25/34; H01J25/42; H01J25/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2122538A
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US2241976A
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US2300052A
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US2367295A
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US2409992A
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US2428612A
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US2439401A
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US2509419A
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US2620458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |