Patent US3551914A successfully refreshed from Google Patents.
US3551914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Natural action toe lift artificial foot
Assignee: Individual
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Filing: 1968-05-09
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Granted: 1971-01-05
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Expires: 1988-05-09
Abstract
Abstract AN ARITIFICAL FOOT HAVING A NATURAL TOE LIFT, IN WHICH A HINGED TOE SECTION OF THE FOOT IS INTERCONNECTED WITH A PIVOTALLY CONNECTED SHANK MEMBER THROUGH A MOTION TRANSMITTING CONNECTION SO THAT THE TOE SECTION WILL BE RAISED AND LOWERED IN A NATURAL MANNER DURING THE WALKING PROCESS, RESILIENT MEANS BEING UTILIZED TO EFFECT ARTICULATED MOVEMENT BETWEEN THE SHANK MEMBER AND FOOT TO RAISE OR LIFT THE TOE SECTION WHEN WALKING PRESSURE UPON THE HEEL SECTION OF THE FOOT IS RELIEVED, AND LOWER THE TOE SECTION WHEN WALKING PRESSURE IS APPLIED TO THE HEEL SECTION.
Inventors
- 👤 Carl Woodall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:06
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/50; A61F2/60; A61F2/66; A61F2/6607; A61F2002/5003; A61F2002/5007; A61F2002/5072; A61F2002/5073; A61F2002/6614; A61F2002/6621
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |