Patent ID: 9702462
Date: 2017-07-11
CPC Classifications: B29C,C09K,F16J,Y10T

Claim:
1. A seal ring comprising: a bent extruded rod having two ends and including two end portions formed of a first material and a center portion formed of a second material different than the first material, wherein the center portion makes up a majority of an overall circumferential length of the seal ring, wherein the center portion is disposed circumferentially between the two end portions such that the material composition of the seal ring changes along its circumference, wherein each end portion makes up a smaller portion of the overall circumferential length of the seal ring than the center portion, and wherein each of the end and center portions is defined by a complete circumferential segment of the bent extruded rod; wherein the first material is an unfilled polyketone material and the second material is a composite polyketone material comprising a polyketone matrix and a filler dispersed within the polyketone matrix; and wherein a weld joins the two end portions of the bent extruded rod to form a complete annular ring-shaped body of the seal ring, wherein only the unfilled polyketone material of each end portion is welded together, and wherein the weld is annealed and void free while still having an elongation-at-break of at least 20%.