US1645305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound-translating device
Assignee: Westinghouse Electric Corp
•
Filing: 1924-08-28
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Granted: 1927-10-11
•
Expires: 1944-08-28
Abstract
No abstract record available.
Inventors
- 👤 Slepian Joseph
- 👤 Clinton R Hanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:29
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/002
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) | 1930-10-10 | 1931-04-11 | 1931-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-10-10 | 1935-04-11 | 1935-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-10-10 | 1939-04-11 | 1939-10-11 | $7700.00 | Window Closed / Lapsed |