US2567380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parallel telectrical wave transmission network
Assignee: AT&T Inc
•
Filing: 1949-03-31
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Granted: 1951-09-11
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Expires: 1969-03-31
Abstract
No abstract record available.
Inventors
- 👤 Burton A Kingsbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:56
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/06; H03H7/065; H03H7/17; H03H7/1708; H03H7/1716; H03H7/1725; H03H7/1741; H03H7/1758; H03H7/1766; H03H7/1791
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2029698A
Cited
US2058210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |