US2536664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic sound system for recordings
Assignee: RCA Corp
•
Filing: 1945-09-10
•
Granted: 1951-01-02
•
Expires: 1965-09-10
Abstract
No abstract record available.
Inventors
- 👤 Chester M Sinnett
- 👤 Belar Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:23
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/68; G; G11; G11B; G11B23/00; G11B23/18; G11B3/00; H04; H04S; H04S1/00; Y; Y10; Y10S; Y10S84/00; Y10S84/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1675894A
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US1685357A
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US1855149A
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US1707260A
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US1799795A
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US1797317A
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US1910254A
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US2114019A
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US2292014A
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US2261628A
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US2258662A
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US2343471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |