US2691749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibrating reed assembly with damping
Assignee: DUALEX Corp
•
Filing: 1952-04-22
•
Granted: 1954-10-12
•
Expires: 1972-04-22
Abstract
No abstract record available.
Inventors
- 👤 James D Durkee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:38
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26; H01; H01H; H01H51/00; H01H51/30; H01H51/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1159189A
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US1226775A
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GB261384A
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CH169465A
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DE699782C
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US2126562A
Cited
US2356229A
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US2494451A
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US2448298A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |