US2498210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric phonograph pickup device
Assignee: Avco Manufacturing Corp
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Filing: 1948-11-02
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Granted: 1950-02-21
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Expires: 1968-11-02
Abstract
No abstract record available.
Inventors
- 👤 Charles E Kilgour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:21
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/04; H04R17/08; H04R1/00; H04R1/16
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) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |