US2689275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodynamic pickup
Assignee: Individual
•
Filing: 1950-05-04
•
Granted: 1954-09-14
•
Expires: 1970-05-04
Abstract
No abstract record available.
Inventors
- 👤 Hansen Hans Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:49
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB599247A
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US2351353A
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US1767610A
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US2148796A
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US2249161A
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US2400662A
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FR904172A
Cited
US2416082A
Cited
US2496483A
Cited
US2554209A
Cited
US2566604A
Cited
US2591996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |