US2553539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional microphone with a compliant link interconnected between the two diaphragms
Assignee: Shure Inc
•
Filing: 1947-06-16
•
Granted: 1951-05-22
•
Expires: 1967-06-16
Abstract
No abstract record available.
Inventors
- 👤 Benjamin B Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:54
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL15084C
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US687999A
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GB272263A
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US1814458A
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US2198424A
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US2174197A
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US2305598A
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US2305597A
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US2305596A
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US2305599A
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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) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |