US2617894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodynamic recording device
Assignee: Individual
•
Filing: 1948-01-10
•
Granted: 1952-11-11
•
Expires: 1968-01-10
Abstract
No abstract record available.
Inventors
- 👤 Arentzen Holger Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:13
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/12; H04R3/00; H04R3/002; H04R9/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1535538A
Cited
US1833070A
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US1803273A
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US1995177A
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US2155469A
Cited
US2161489A
Cited
US2386089A
Cited
US2406597A
Cited
US2410329A
Cited
US2461190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |