Patent US2994535A successfully refreshed from Google Patents.
US2994535A
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US
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Arrangement of spools in a wire stock replacement unit for magnetic sound recording and reproducing apparatus
Assignee: PROTONA PRODUKTIONSGES
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Filing: 1954-09-08
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Granted: 1961-08-01
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Expires: 1974-09-08
Abstract
No abstract record available.
Inventors
- 👤 Genning Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:13
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/66; G11B15/662; G11B5/00; G11B2005/0002; Y; Y10; Y10S; Y10S242/00; Y10S242/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB236237A
Cited
GB236574A
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DE633160C
Cited
US2484552A
Cited
US2490053A
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US2535478A
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US2437997A
Cited
US2499895A
Cited
US2527391A
Cited
DE864753C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |