US3417409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam operated hydraulic knee joint for an artificial leg
Assignee: Individual
•
Filing: 1966-09-27
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Granted: 1968-12-24
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Expires: 1986-09-27
Abstract
No abstract record available.
Inventors
- 👤 Prahl Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:34
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/50; A61F2/68; A61F2/60; A61F2/64; A61F2/74; A61F2/748; A61F2/02; A61F2/30; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30362; A61F2002/3037; A61F2002/30476; A61F2002/30492; A61F2002/30507; A61F2220/00; A61F2220/0025; A61F2220/0033
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A KNEE JOINT FOR AN ARTIFICIAL LEG, HAVING AN ELONGATED LOWER PORTION COMPRISING, IN COMBINATION: (A) A CYLINDER MEMBER DEFINING A CAVITY AND AN EXPANSION CHAMBER THEREIN, AND BEING FORMED WITH CONDUIT MEANS; (B) A SHAFT MEMBER ROTATABLE IN SAID CYLINDER MEMBER ABOUT AN AXIS; (C) FASTENING MEANS FOR SECURING SAID MEMBERS RESPECTIVELY TO THE THIGH PORTION AND THE LOWER PORTION OF AN ARTIFICIAL LEG IN A POSITION IN WHICH SAID AXIS IS TRANSVERSE OF THE DIRECTION OF ELONGATION OF SAID LOWER PORTION; (D) A PISTON AXIALLY MOVABLE IN SAID CAVITY IN SEALING ENGAGEMENT WITH SAID CYLINDER MEMBER, SAID PISTON MEMBER DIVIDING THE CAVITY INTO A PRESSURE CHAMBER AND A COMPARTMENT, SAID PRESSURE CHAMBER BEING CONNECTED TO SAID EXPANSION CHAMBER BY SAID CONDUIT MEANS;
Claim 2
Dependent Claim
124 words
A KNEE JOINT FOR AN ARTIFICIAL LEG, HAVING AN ELONGATED LOWER PORTION COMPRISING, IN COMBINATION: (A) A CYLINDER MEMBER DEFINING A CAVITY AND AN EXPANSION CHAMBER THEREIN, AND BEING FORMED WITH CONDUIT MEANS; (B) A SHAFT MEMBER ROTATABLE IN SAID CYLINDER MEMBER ABOUT AN AXIS; (C) FASTENING MEANS FOR SECURING SAID MEMBERS RESPECTIVELY TO THE THIGH PORTION AND THE LOWER PORTION OF AN ARTIFICIAL LEG IN A POSITION IN WHICH SAID AXIS IS TRANSVERSE OF THE DIRECTION OF ELONGATION OF SAID LOWER PORTION; (D) A PISTON AXIALLY MOVABLE IN SAID CAVITY IN SEALING ENGAGEMENT WITH SAID CYLINDER MEMBER, SAID PISTON MEMBER DIVIDING THE CAVITY INTO A PRESSURE CHAMBER AND A COMPARTMENT, SAID PRESSURE CHAMBER BEING CONNECTED TO SAID EXPANSION CHAMBER BY SAID CONDUIT MEANS;
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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |