Patent US1907812A successfully refreshed from Google Patents.
US2632634A
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Electroacoustic device
Assignee: Brush Development Co
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Filing: 1950-09-23
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Granted: 1953-03-24
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Expires: 1970-09-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred L W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:35
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/32; Y; Y10; Y10S; Y10S159/00; Y10S159/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |