Patent 5423177 Issued on June 13, 1995. Estimated Expiration Date: July 26, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
A yarn draw-off nozzle for an open-end spinning station of a rotor spinning machine includes a yarn feed region including a spiral having at least one turn with spirally extending surfaces disposed one above the other being rectilinear with respect to a yarn travel direction. The surfaces are each inclined at an angle relative to the surfaces located above and below them, defining spirally extending yarn deflection locations for supporting yarn to be drawn off.