Patent US1609540A successfully refreshed from Google Patents.
US1609540A
Expired / Lapsed
US
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Sound-reproducing device
Assignee: Individual
•
Filing: 1921-06-18
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Granted: 1926-12-07
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Expires: 1941-06-18
Abstract
No abstract record available.
Inventors
- 👤 Robert H Goddard
- 👤 Louis T E Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:07
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/24; Y; Y10; Y10S; Y10S60/00; Y10S60/915
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) | 1929-12-06 | 1930-06-07 | 1930-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-12-06 | 1934-06-07 | 1934-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-12-06 | 1938-06-07 | 1938-12-07 | $7700.00 | Window Closed / Lapsed |