US3053934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier system for stereo sound
Assignee: Erie Resistor Corp
•
Filing: 1959-04-21
•
Granted: 1962-09-11
•
Expires: 1979-04-21
Abstract
No abstract record available.
Inventors
- 👤 Robert B Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:33
CPC Classifications
H; H04; H04R; H04R5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1893044A
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US2565231A
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US2605333A
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DK76677A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |