Patent US2896189A successfully refreshed from Google Patents.
US2896189A
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US
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Higher order pressure gradient microphone system having adjustable polar response pattern
Assignee: Bosch Security Systems Inc
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Filing: 1952-02-08
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Granted: 1959-07-21
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Expires: 1972-02-08
Abstract
No abstract record available.
Inventors
- 👤 Alpha M Wiggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:37
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/005; G; G01; G01S; G01S1/00; G01S1/72; Y; Y10; Y10S; Y10S367/00; Y10S367/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2548671A
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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) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |