Patent US3906930A successfully refreshed from Google Patents.
Patent US2305291A successfully refreshed from Google Patents.
US2305291A
Expired / Lapsed
US
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Device for the automatic control of the articulation of the knee applicable to a prothesis of the thigh
Assignee: Individual
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Filing: 1937-06-24
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Granted: 1942-12-15
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Expires: 1957-06-24
Abstract
No abstract record available.
Inventors
- 👤 Filippi Pietro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:27
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/50; A61F2/60; A61F2/64; A61F2/68; A61F2/74; A61F2/748
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-12-14 | 1946-06-15 | 1946-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-12-14 | 1950-06-15 | 1950-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-12-14 | 1954-06-15 | 1954-12-15 | $7700.00 | Window Closed / Lapsed |