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Patent US2765043A successfully refreshed from Google Patents.
US2765043A
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US
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Sound radiator
Assignee: Hartford National Bank and Trust Co
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Filing: 1952-07-23
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Granted: 1956-10-02
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Expires: 1972-07-23
Abstract
No abstract record available.
Inventors
- 👤 Muller Friedrich Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:00
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US205922A
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US763808A
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US1778671A
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US1882974A
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US1707960A
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US1877294A
Cited
US1837755A
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US1891968A
Cited
US2005300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |