US2488482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording and transcribing mechanism
Assignee: Individual
•
Filing: 1947-10-15
•
Granted: 1949-11-15
•
Expires: 1967-10-15
Abstract
No abstract record available.
Inventors
- 👤 David S Swarthout
- 👤 John W Atkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:25
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G07; G07F; G07F17/00; G07F17/30; G07F17/305; G11B15/005; G11B25/00; G11B25/08
Claims Analysis
Total Claims: 0
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US2422143A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-14 | 1953-05-16 | 1953-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-14 | 1957-05-16 | 1957-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-14 | 1961-05-16 | 1961-11-15 | $7700.00 | Window Closed / Lapsed |