Patent US2830283A successfully refreshed from Google Patents.
US2830283A
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Directional characteristics of electroacoustic transducers and method for utilizing the same
Assignee: Individual
•
Filing: 1950-04-18
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Granted: 1958-04-08
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Expires: 1970-04-18
Abstract
No abstract record available.
Inventors
- 👤 Massa Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:26
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/28; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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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) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |