US2536810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for improving the low-frequency response in magnetic recording and reproducing units
Assignee: Stromberg Carlson Corp
•
Filing: 1945-04-16
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Granted: 1951-01-02
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Expires: 1965-04-16
Abstract
No abstract record available.
Inventors
- 👤 Lynn C Holmes
- 👤 Donald L Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:58
CPC Classifications
G; G11; G11B; G11B5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE594991C
Cited
US2285079A
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US2251300A
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US2300320A
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US2351010A
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US2416279A
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US2432162A
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US2435871A
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 |