US2093540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound-transmission, sound-recording, and sound-reproducing system
Assignee: EMI Ltd
•
Filing: 1932-12-13
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Granted: 1937-09-21
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Expires: 1952-12-13
Abstract
No abstract record available.
Inventors
- 👤 Blumlein Alan Dower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/04; H04R11/00; H04R11/08; H04R11/12; H04R9/00; H04R9/12; H04R9/16; H04S; H04S1/00; H04S1/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-09-20 | 1941-03-22 | 1941-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-09-20 | 1945-03-22 | 1945-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-09-20 | 1949-03-22 | 1949-09-21 | $7700.00 | Window Closed / Lapsed |