Patent US2837743A successfully refreshed from Google Patents.
US2479868A
Expired / Lapsed
US
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Sound motion-picture film
Assignee: Individual
•
Filing: 1947-04-24
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Granted: 1949-08-23
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Expires: 1967-04-24
Abstract
No abstract record available.
Inventors
- 👤 Peter F Rossmann
- 👤 Rath Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/633
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1489314A
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US1832097A
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US1653467A
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US1679708A
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US1808046A
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US1883559A
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US1866712A
Cited
GB389434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |