US1567265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone-exchange system
Assignee: AT&T Inc
•
Filing: 1923-12-03
•
Granted: 1925-12-29
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Expires: 1943-12-03
Abstract
No abstract record available.
Inventors
- 👤 Edward E Hinrichsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:58
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
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) | 1928-12-28 | 1929-06-29 | 1929-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-12-28 | 1933-06-29 | 1933-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-12-28 | 1937-06-29 | 1937-12-29 | $7700.00 | Window Closed / Lapsed |