Patent US2615995A successfully refreshed from Google Patents.
US2615995A
Expired / Lapsed
US
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Moving coil loud-speaker
Assignee: Individual
•
Filing: 1949-10-26
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Granted: 1952-10-28
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Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Voigt Paul Gustavus Ad Helmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:04
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R1/00; H04R1/20; H04R1/22; H04R1/30
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) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |