US3909855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Below-the-knee prosthesis
Assignee: Individual
•
Filing: 1974-11-12
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Granted: 1975-10-07
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Expires: 1994-11-12
Abstract
Abstract A hollow, rigid, lightweight nonarticulated prosthesis with a foreshortened foot fits the stump of a below-the-knee amputee and has an optional simple above the knee-cap holding strap to secure the prosthesis when the knee is straightened. The center of mass of the prosthesis is much closer to the knee than is the center of mass of a natural leg.
Inventors
- 👤 Joseph G Barredo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/50; A61F2/60; A61F2002/5001
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A walking prosthesis for fitting a below-the-knee stump comprising a hollow, one-piece, rigid, lightweight leg corresponding generally in form to the human leg having a socket fitted to receive the stump, and with a weight several times less than that of the natural leg and the foot portion shortened at the toe end by an amount approximating the natural toe length.
Claim 2
Dependent Claim
61 words
A walking prosthesis for fitting a below-the-knee stump comprising a hollow, one-piece, rigid, lightweight leg corresponding generally in form to the human leg having a socket fitted to receive the stump, and with a weight several times less than that of the natural leg and the foot portion shortened at the toe end by an amount approximating the natural toe length.
Claim 3
Dependent Claim
24 words
The prosthesis of claim 1 in which the bottom of the foot portion curves upward at the toe end to provide a rocking surface.
Claim 4
Dependent Claim
49 words
The prosthesis of claim 1 with a strap loop secured at its ends to the sides of the hollow leg near its top and with a length short enough to engage the wearer''s leg above the knee cap when the knee is straightened for holding the prosthesis in place.
Claim 5
Dependent Claim
25 words
The prosthesis of claim 1 with knee-hinge engaging facing concave side extensions to grasp the ends of the knee-hinge for holding the prosthesis in place.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |