Patent US2552800A successfully refreshed from Google Patents.
US2552800A
Expired / Lapsed
US
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Magnetic microphone
Assignee: E A Myers & Sons
•
Filing: 1947-12-27
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Granted: 1951-05-15
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Expires: 1967-12-27
Abstract
No abstract record available.
Inventors
- 👤 Samuel F Lybarger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:46
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1179117A
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US1548322A
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US1573754A
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US1665078A
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US1554794A
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US1604637A
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US1775453A
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US2077425A
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US2400281A
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US2346429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |