US3023308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound system for outdoor theaters
Assignee: Individual
•
Filing: 1959-02-16
•
Granted: 1962-02-27
•
Expires: 1979-02-16
Abstract
No abstract record available.
Inventors
- 👤 Richard P Herzfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:00
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1818669A
Cited
US2127015A
Cited
US2521150A
Cited
US2531438A
Cited
US2883523A
Cited
US2851537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |