Patent US2660946A successfully refreshed from Google Patents.
US2660946A
Expired / Lapsed
US
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Damper
Assignee: BANK OF COMMERCE AND TRUSTS
•
Filing: 1951-01-30
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Granted: 1953-12-01
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Expires: 1971-01-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:26
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1438981A
Cited
US2224312A
Cited
US2256467A
Cited
US2157025A
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US2281615A
Cited
US2283021A
Cited
US2320007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |