US2689016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproducing system
Assignee: Individual
•
Filing: 1953-04-14
•
Granted: 1954-09-14
•
Expires: 1973-04-14
Abstract
No abstract record available.
Inventors
- 👤 Henry C Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:40
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2838; H04R1/2842; H04R1/2869; H04R1/2876; H04R1/288
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2210477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |