US2812498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aural attenuators
Assignee: Individual
•
Filing: 1953-09-23
•
Granted: 1957-11-05
•
Expires: 1973-09-23
Abstract
No abstract record available.
Inventors
- 👤 Cecil T Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:11
CPC Classifications
H; H03; H03G; H03G9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1864527A
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US2069853A
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US2238023A
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US2322558A
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US2484052A
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US2500493A
Cited
US2680231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |