US1628010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound amplifier
Assignee: EMILIUS C F HARTMANN AND DAVID
•
Filing: 1925-04-22
•
Granted: 1927-05-10
•
Expires: 1945-04-22
Abstract
No abstract record available.
Inventors
- 👤 Charles W Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:24
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/345
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) | 1930-05-09 | 1930-11-08 | 1931-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-05-09 | 1934-11-08 | 1935-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-05-09 | 1938-11-08 | 1939-05-10 | $7700.00 | Window Closed / Lapsed |