US2860183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproducing system
Assignee: Individual
•
Filing: 1954-02-01
•
Granted: 1958-11-11
•
Expires: 1974-02-01
Abstract
No abstract record available.
Inventors
- 👤 Conrad Ivan Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:33
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H04; H04R; H04R3/00; H04R3/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |