US2851537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio system for drive-in theater
Assignee: ROSENBERG
•
Filing: 1955-10-17
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Granted: 1958-09-09
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Expires: 1975-10-17
Abstract
No abstract record available.
Inventors
- 👤 Harold W Rosenberg
- 👤 Jasper L Jeung
- 👤 Hadyn L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:38
CPC Classifications
H; H04; H04B; H04B5/00; F; F21; F21W; F21W2131/00; F21W2131/40; F21W2131/406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2122145A
Cited
US2567431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |