Patent US2005642A successfully refreshed from Google Patents.
Patent US1815010A successfully refreshed from Google Patents.
US1815010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording and reproducing sound
Assignee: EDWIN KING SCHEFTEL
•
Filing: 1929-11-01
•
Granted: 1931-07-14
•
Expires: 1949-11-01
Abstract
No abstract record available.
Inventors
- 👤 Pollock Archibald Fulton
- 👤 Pollock David Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:56
CPC Classifications
G; G11; G11B; G11B5/00; Y; Y10; Y10S; Y10S29/00; Y10S29/028
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) | 1934-07-13 | 1935-01-12 | 1935-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-07-13 | 1939-01-12 | 1939-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-07-13 | 1943-01-12 | 1943-07-14 | $7700.00 | Window Closed / Lapsed |