Patent US2683407A successfully refreshed from Google Patents.
US2683407A
Expired / Lapsed
US
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Speaker-heater apparatus for drive-in theaters
Assignee: Individual
•
Filing: 1952-01-12
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Granted: 1954-07-13
•
Expires: 1972-01-12
Abstract
No abstract record available.
Inventors
- 👤 Takach Sigmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:57
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/0025; B60H1/00257
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1685345A
Cited
US1998924A
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US2230020A
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US2529425A
Cited
GB638107A
Cited
US2619893A
Cited
US2660943A
Cited
US2588086A
Cited
US2588756A
Cited
US2614478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |