US2539593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic system
Assignee: Individual
•
Filing: 1945-07-18
•
Granted: 1951-01-30
•
Expires: 1965-07-18
Abstract
No abstract record available.
Inventors
- 👤 Rines Robert Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:51
CPC Classifications
H; H03; H03C; H03C7/00; H03C7/02; B; B06; B06B; B06B1/00; B06B1/02; G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1763220A
Cited
GB344523A
Cited
US2063946A
Cited
DE596439C
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DE694523C
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US2407328A
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US2061699A
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US2444967A
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US2412631A
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US2434926A
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US2421263A
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US2461005A
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US2448787A
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US2415407A
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US2402459A
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US2431018A
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US2437270A
Cited
US2406111A
Cited
US2448713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |