US2691518A
Expired / Lapsed
US
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Hydraulic stiffness system
Assignee: VIBRO DYNAMIC ENGINEERING Inc
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Filing: 1949-01-04
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Granted: 1954-10-12
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Expires: 1969-01-04
Abstract
No abstract record available.
Inventors
- 👤 Edward W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:06
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B1/04; F15B2201/00; F15B2201/20; F15B2201/30; F15B2201/31; F15B2201/312; F15B2201/40; F15B2201/41; F15B2201/413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2290479A
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FR871807A
Cited
US2341556A
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US2318437A
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US2452176A
Cited
GB597252A
Cited
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 |