Patent US3475031A successfully refreshed from Google Patents.
US3475031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproducing apparatus
Assignee: Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Filing: 1966-08-18
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Granted: 1969-10-28
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Expires: 1986-08-18
Abstract
No abstract record available.
Inventors
- 👤 Dieter Kuehnlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:24
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/675; G11B15/6751; G11B15/67513; G11B15/02; G11B15/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2867389A
Cited
DE966791C
Cited
US2914620A
Cited
US2876005A
Cited
US3080101A
Cited
US3350025A
Cited
DE1207653B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |