US2658113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for improving the performance of magnetic sound recording and reproducing heads
Assignee: Stromberg Carlson Corp
•
Filing: 1949-10-03
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Granted: 1953-11-03
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Expires: 1969-10-03
Abstract
No abstract record available.
Inventors
- 👤 Lynn C Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:25
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2215782A
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US2413108A
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US2493742A
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US2574707A
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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) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |