US3001027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Private line transfer switching circuit
Assignee: AT&T Inc
•
Filing: 1960-04-07
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Granted: 1961-09-19
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Expires: 1980-04-07
Abstract
No abstract record available.
Inventors
- 👤 James M Armstrong
- 👤 Myron C Goddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:42
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04; H04M9/00; H04M9/002; H04M9/005
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |