US2059588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic device
Assignee: AT&T Inc
•
Filing: 1933-10-12
•
Granted: 1936-11-03
•
Expires: 1953-10-12
Abstract
No abstract record available.
Inventors
- 👤 John J Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:27
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/02; H04R5/023; H04R1/00; H04R1/10; H04R1/1091
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1939-11-03 | 1940-05-04 | 1940-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-11-03 | 1944-05-04 | 1944-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-11-03 | 1948-05-04 | 1948-11-03 | $7700.00 | Window Closed / Lapsed |