US2157158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproducing apparatus
Assignee: RCA Corp
•
Filing: 1937-11-05
•
Granted: 1939-05-09
•
Expires: 1957-11-05
Abstract
No abstract record available.
Inventors
- 👤 Gregory W Blessing
- 👤 Emile C Guedon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:42
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/60
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) | 1942-05-08 | 1942-11-07 | 1943-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-08 | 1946-11-07 | 1947-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-08 | 1950-11-07 | 1951-05-09 | $7700.00 | Window Closed / Lapsed |