Patent US2064906A successfully refreshed from Google Patents.
US2064906A
Expired / Lapsed
US
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Common medium multichannel exchange system
Assignee: AT&T Inc
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Filing: 1934-05-26
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Granted: 1936-12-22
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Expires: 1954-05-26
Abstract
No abstract record available.
Inventors
- 👤 Estill I Green
- 👤 Warren H Tidd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:53
CPC Classifications
H; H04; H04W; H04W88/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-12-22 | 1940-06-22 | 1940-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-12-22 | 1944-06-22 | 1944-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-12-22 | 1948-06-22 | 1948-12-22 | $7700.00 | Window Closed / Lapsed |