US3440361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective frequency band compression for modulated groove sound recording
Assignee: EMI Ltd
•
Filing: 1965-01-25
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Granted: 1969-04-22
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Expires: 1985-01-25
Abstract
No abstract record available.
Inventors
- 👤 Michael Batchelor
- 👤 Donald William Harley Paine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:23
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2122207A
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US2284744A
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US2343471A
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US2791640A
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US3075052A
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US3013125A
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US3111635A
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US3223789A
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US3292116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |