US2876285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switching network for communication system
Assignee: AT&T Inc
•
Filing: 1953-02-02
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Granted: 1959-03-03
•
Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Bjorn G Bjornson
- 👤 Bruce Edmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2291752A
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US2627039A
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US2780674A
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US2620448A
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US2590950A
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US2629021A
Cited
US2722567A
Cited
US2622212A
Cited
US2706811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |