Patent US1748225A successfully refreshed from Google Patents.
US1748225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input and output amplifying unit
Assignee: Individual
•
Filing: 1925-11-16
•
Granted: 1930-02-25
•
Expires: 1945-11-16
Abstract
No abstract record available.
Inventors
- 👤 Edward G Hoch
- 👤 Joel L Wallin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:38
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30
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) | 1933-02-24 | 1933-08-26 | 1934-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-02-24 | 1937-08-26 | 1938-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-02-24 | 1941-08-26 | 1942-02-25 | $7700.00 | Window Closed / Lapsed |