Patent US2845491A successfully refreshed from Google Patents.
US2845491A
Expired / Lapsed
US
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Stereophonic apparatus
Assignee: Telefunken AG
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Filing: 1956-12-17
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Granted: 1958-07-29
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Expires: 1976-12-17
Abstract
No abstract record available.
Inventors
- 👤 Bertram Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:41
CPC Classifications
H; H04; H04S; H04S3/00; H04R; H04R5/00; H04R5/027; H04S2400/00; H04S2400/01; H04S2400/05; Y; Y10; Y10S; Y10S84/00; Y10S84/27
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |