Patent ID: 9322221
Filing Date: 2016-04-26
CPC Classification: B05D,B29C,B29K,B29L,B63B,E21B,F16F,F16L

Claim Text:
1. A marine riser comprising: a substantially cylindrical buoyancy module surrounding the marine riser, the buoyancy module comprising at least two buoyancy elements; a first helical groove extending about an entire length and an outer periphery of the buoyancy module; and a second helical groove extending about the entire length and the outer periphery of the buoyancy module wherein the at least two buoyancy elements are spaced apart by the first helical groove and the second helical groove, and wherein one of the first helical groove and the second helical groove have a right handed pitch and the other of the first helical groove and the second helical groove have a left handed pitch.