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Patent US2444620A successfully refreshed from Google Patents.
US2444620A
Expired / Lapsed
US
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Damping means for mechanical vibratory devices
Assignee: Brush Development Co
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Filing: 1944-06-23
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Granted: 1948-07-06
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Expires: 1964-06-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred L W Williams
- 👤 Dean R Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:11
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1488565A
Cited
US1556658A
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US1851208A
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US1864615A
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US1986197A
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US2059588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |