US2644684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cushioning mechanism
Assignee: National Malleable and Steel Castings Co
•
Filing: 1947-05-09
•
Granted: 1953-07-07
•
Expires: 1967-05-09
Abstract
No abstract record available.
Inventors
- 👤 Hubert L Spence
- 👤 Willison Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:37
CPC Classifications
F; F16; F16F; F16F3/00; F16F3/08; F16F3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1255214A
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US2216231A
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US2211463A
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US2286861A
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US2352030A
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US2381404A
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US2306398A
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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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |