Patent US2660943A successfully refreshed from Google Patents.
US2660943A
Expired / Lapsed
US
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Sound and heating apparatus for drive-in theaters
Assignee: Individual
•
Filing: 1948-09-22
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Granted: 1953-12-01
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Expires: 1968-09-22
Abstract
No abstract record available.
Inventors
- 👤 Walter G Dion
- 👤 Gerald J Dion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:57
CPC Classifications
A; A63; A63J; A63J25/00; H; H04; H04R; H04R1/00; H04R1/02; H04R1/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1185987A
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US1481870A
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US1466093A
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US1952514A
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US2096022A
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US2161995A
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US2045180A
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US2091594A
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US2085470A
Cited
US2218212A
Cited
US2529425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |