US1778378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: AT&T Inc
•
Filing: 1929-04-27
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Granted: 1930-10-14
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Expires: 1949-04-27
Abstract
No abstract record available.
Inventors
- 👤 Edward D Butz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:54
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/20; H04Q1/22; H04Q1/24
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) | 1933-10-13 | 1934-04-14 | 1934-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-10-13 | 1938-04-14 | 1938-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-10-13 | 1942-04-14 | 1942-10-14 | $7700.00 | Window Closed / Lapsed |