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US2755796A
Expired / Lapsed
US
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Electrostatic transducers
Assignee: RADIO PATENTS Co
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Filing: 1952-03-21
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Granted: 1956-07-24
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Expires: 1972-03-21
Abstract
No abstract record available.
Inventors
- 👤 Boucke Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:23
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02; A61B7/04; H; H04; H04R; H04R19/00; H04R19/06
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) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |