The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 2014
Filed:
Oct. 14, 2010
Karl A. Parfrey, Houston, TX (US);
Karl A. Parfrey, Houston, TX (US);
Vetco Gray Inc., Houston, TX (US);
Abstract
A method and apparatus for forming a tubular from a composite material. The composite material includes fibers and epoxy resin that are formed into plies that are wound around an axis to form an annular member. The fibers in each ply are arranged axially and hoopwise. The axially oriented fibers are angled from about 10° up to about 20° with respect to an axis of the tubular. The hoopwise fibers are wound in the plies ranging from about 60° at the innermost ply up to about 90° in the outermost ply. The hoop fibers in the intermediate plies are arranged at increasing angles with distance away from the innermost layer. Transitioning the hoop fiber alignment in the successive plies better distributes hoop stress through the wall of the tubular thereby reducing stress concentrations on the innermost ply.