US2215585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound listening device
Assignee: Thomas A Edison Inc
•
Filing: 1937-10-28
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Granted: 1940-09-24
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Expires: 1957-10-28
Abstract
No abstract record available.
Inventors
- 👤 Huenlich Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:28
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/10; H04R1/1041; H04M; H04M1/00; H04M1/02; H04M1/04; H04M1/05; H04R1/1008; H04R1/20; H04R1/32; H04R1/34; H04R1/345
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) | 1943-09-24 | 1944-03-25 | 1944-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-24 | 1948-03-25 | 1948-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-24 | 1952-03-25 | 1952-09-24 | $7700.00 | Window Closed / Lapsed |