US2573122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual speaker control
Assignee: Zenith Electronics LLC
•
Filing: 1949-05-11
•
Granted: 1951-10-30
•
Expires: 1969-05-11
Abstract
No abstract record available.
Inventors
- 👤 Weber Rennie Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:44
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1695875A
Cited
US1883624A
Cited
US1892935A
Cited
US1887065A
Cited
US2023603A
Cited
US2037842A
Cited
US2030573A
Cited
US2262757A
Cited
US2404387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |