US2840178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the reproduction of sound
Assignee: Tesla AS
•
Filing: 1955-01-03
•
Granted: 1958-06-24
•
Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Boleslav Ales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:23
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/24; H04R1/28; H04R1/2803
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1965830A
Cited
US2071828A
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US2022060A
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US2214393A
Cited
US2475782A
Cited
US2426928A
Cited
US2761912A
Cited
US2670807A
Cited
US2689016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |