Patent US2627558A successfully refreshed from Google Patents.
US2627558A
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US
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Unidirectional microphone
Assignee: Bosch Security Systems Inc
•
Filing: 1946-07-22
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Granted: 1953-02-03
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Expires: 1966-07-22
Abstract
No abstract record available.
Inventors
- 👤 Alpha M Wiggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:20
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/08; H04R1/083; H04R1/20; H04R1/32; H04R1/34; H04R1/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2126436A
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US2179361A
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US2198424A
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US2293258A
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US2301638A
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US2301744A
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GB567955A
Cited
US2498825A
Cited
US2444620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-03 | 1956-08-04 | 1957-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-03 | 1960-08-04 | 1961-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-03 | 1964-08-04 | 1965-02-03 | $7700.00 | Window Closed / Lapsed |