US3833941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded sach foot
Assignee: WAGNER S ORTHOPEDIC SUPPLY CO
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Filing: 1973-02-28
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Granted: 1974-09-10
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Expires: 1993-02-28
Abstract
Abstract An artificial foot having a wooden keel in the ankle portion which has a diminished heel portion, a flat arch portion, a curved instep portion, a rounded lower front end portion and a flat top; a molded soft resilient foam coating on said keel which has heel and toe portions; and a reinforcing member comprising a highly resilient synthetic resin (preferably nylon) strip secured at its rear end to said flat arch portion and its front end extending into said toe portion to give it predetermined flexibility. Coatings on exposed broad surfaces of said strip bond it to said foam coating. A method of making such artificial feet, particularly with keel portions of predetermined variable density and toe portions of predetermined flexibility, by fashioning the keel with its heel portion properly diminished for the predetermined heel density, preparing the reinforcing strip to provide the predetermined toe flexibility by choice of composition gauge, length and number of highly resilient synthetic resin (preferably at least one nylon) strips, securing it properly to the keel and molding the soft synthetic resin foam on and bonding it to said keel and reinforcing member.
Inventors
- 👤 E Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:14
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/1271; A; A61; A61F; A61F2/00; A61F2/50; A61F2/60; A61F2/66; A61F2002/6614; A61F2002/6657
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
123 words
An artificial foot comprising an internal keel in the ankle region of the foot, said keel having a flat top portion, a diminshed heel portion, a substantially flat arch portion, a curved instep portion and a rounded lower front end portion extending to about a transverse vertical plane through the ball of the foot; a one-piece molded soft resilient foot-forming foam coating under and around said keel; and a reinforcing member comprising a highly resilient synthetic resin strip secured at its rear end to the flat arch portion of said keel with its front end extending into the toe to give it predetermined flexibility, said strip having an adherent surface material on its exposed broad surfaces bonded with said soft resilient foam coating.
Claim 2
Dependent Claim
123 words
An artificial foot comprising an internal keel in the ankle region of the foot, said keel having a flat top portion, a diminshed heel portion, a substantially flat arch portion, a curved instep portion and a rounded lower front end portion extending to about a transverse vertical plane through the ball of the foot; a one-piece molded soft resilient foot-forming foam coating under and around said keel; and a reinforcing member comprising a highly resilient synthetic resin strip secured at its rear end to the flat arch portion of said keel with its front end extending into the toe to give it predetermined flexibility, said strip having an adherent surface material on its exposed broad surfaces bonded with said soft resilient foam coating.
Claim 3
Dependent Claim
18 words
An artificial foot as set forth in claim 1 in which said reinforcing member comprises a nylon strip.
Claim 4
Dependent Claim
24 words
An artificial foot as set forth in claim 1 in which said reinforcing member comprises a long nylon strip and a short supplemental strip.
Claim 5
Dependent Claim
18 words
An artificial foot as set forth in claim 2 in which said molded soft resilient foam is polyurethane.
Claim 6
Dependent Claim
33 words
An artificial foot as set forth in claim 2 in which the predetermined flexibility of the toe is within the range of 15-50 mm. as determined by the herein described toe flexibility test.
Claim 7
Dependent Claim
26 words
An artificial foot as set forth in claim 2 in which the strip is nylon having a gauge within the range of 3 to 6 mm.
Claim 8
Dependent Claim
33 words
An artificial foot as set forth in claim 6 in which the flexibility of the toe is predetermined by the gauge of the nylon strip supplemented by a shorter strip of reinforcing material.
Claim 9
Dependent Claim
19 words
An artificial foot as set forth in claim 7 in which both strips of reinforcing material are oriented nylon.
Claim 10
Dependent Claim
18 words
An artificial foot as set forth in claim 8 in which said molded soft resilient foam is polyurethane.
Claim 11
Dependent Claim
19 words
An artificial foot as set forth in claim 8 in which said nylon strips are joined face to face.
Claim 12
Dependent Claim
104 words
An artificial foot comprising an internal keel in the ankle region of the foot, said keel having a flat top portion, a diminished heel portion, a substantially flat arch portion, a curved instep portion aNd a rounded lower front end portion extending to about a transverse vertical plane through the ball of the foot; a one-piece molded soft resilient foot-forming foam coating under and around said keel; and a reinforcing member comprising a highly resilient synthetic resin strip secured at its rear end to the flat arch portion of said keel with its front end extending into the toe to give it predetermined flexibility.
Claim 13
Dependent Claim
104 words
An artificial foot comprising an internal keel in the ankle region of the foot, said keel having a flat top portion, a diminished heel portion, a substantially flat arch portion, a curved instep portion aNd a rounded lower front end portion extending to about a transverse vertical plane through the ball of the foot; a one-piece molded soft resilient foot-forming foam coating under and around said keel; and a reinforcing member comprising a highly resilient synthetic resin strip secured at its rear end to the flat arch portion of said keel with its front end extending into the toe to give it predetermined flexibility.
Claim 14
Dependent Claim
30 words
An artificial foot as set forth in claim 11 in which the toe flexibility as determined by the herein described toe flexibility test is within the range of 15-50 mm.
Claim 15
Dependent Claim
31 words
An artificial foot as set forth in claim 11 in which the toe flexibility as determined by the herein described toe flexibility test is within the soft range of 39-50 mm.
Claim 16
Dependent Claim
31 words
An artificial foot as set forth in claim 11 in which the toe flexibility as determined by the herein described toe flexibility test is within the medium range of 27-38 mm.
Claim 17
Dependent Claim
31 words
An artificial foot as set forth in claim 11 in which the toe flexibility as determined by the herein described toe flexibility test is within the firm range of 15-26 mm.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |