US2974424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound simulator circuit
Assignee: ACF Industries Inc
•
Filing: 1958-01-10
•
Granted: 1961-03-14
•
Expires: 1978-01-10
Abstract
No abstract record available.
Inventors
- 👤 Perry M Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:10
CPC Classifications
G; G09; G09B; G09B9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2494594A
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US2445712A
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US2731737A
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US2749441A
Cited
GB726878A
Cited
US2826691A
Cited
US2898587A
Cited
US2819460A
Cited
US2768371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |