US1990548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound recorder and reproducer
Assignee: AT&T Inc
•
Filing: 1934-06-20
•
Granted: 1935-02-12
•
Expires: 1954-06-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Keller
- 👤 Vernon Mount
- 👤 Irad S Rafuse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/16; G11B21/20; G11B3/00; G11B3/02; G11B3/10; G11B3/12
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) | 1938-02-11 | 1938-08-13 | 1939-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-02-11 | 1942-08-13 | 1943-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-02-11 | 1946-08-13 | 1947-02-12 | $7700.00 | Window Closed / Lapsed |