US1601063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic device
Assignee: AT&T Inc
•
Filing: 1924-05-19
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Granted: 1926-09-28
•
Expires: 1944-05-19
Abstract
No abstract record available.
Inventors
- 👤 Halsey A Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:12
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/60; H04R25/65; H04R25/658; H04R25/659
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) | 1929-09-27 | 1930-03-29 | 1930-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-09-27 | 1934-03-29 | 1934-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-09-27 | 1938-03-29 | 1938-09-28 | $7700.00 | Window Closed / Lapsed |