US2580376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio signal modifying apparatus
Assignee: GTE Sylvania Inc
•
Filing: 1946-05-09
•
Granted: 1951-12-25
•
Expires: 1966-05-09
Abstract
No abstract record available.
Inventors
- 👤 Robert C Moses
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:25
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1998619A
Cited
US2052110A
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US2186195A
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US2315042A
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US2258762A
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US2247468A
Cited
US2357696A
Cited
US2363813A
Cited
US2361198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |