US2750451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio system
Assignee: Motorola Solutions Inc
•
Filing: 1951-03-13
•
Granted: 1956-06-12
•
Expires: 1971-03-13
Abstract
No abstract record available.
Inventors
- 👤 Robert P Crow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:05
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1979035A
Cited
US2245353A
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US2259520A
Cited
US2295410A
Cited
US2390502A
Cited
US2405845A
Cited
US2390856A
Cited
US2533253A
Cited
GB640920A
Cited
US2673899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |